NCERT Solutions for Class 6 Maths Chapter 14 Practical Geometry

NCERT class 6 maths chapter 14 practical geometry exercise 14.1

Question: 1 Draw a circle of radius 3.2 cm.

Answer: To draw a circle of radius 3.2 cm follow the steps given below:

(i) Take compasses for the required radius of 3.2 cm.

(ii) Mark point O where you want the centre of the circle.

(iii) After placing the compass on O, rotate the compasses slowly to make the circle.

Question: 2 With the same centre O, draw two circles of radii 4 cm and 2.5 cm .

Answer: To draw the required circle follow the steps as follows:

(i) First, Set the compass for radius 4 cm

(ii) Mark point O which will be the centre for the circles.

(iiI) Place the pointer of compasses on O.

(iv) Turn the compasses slowly to draw the circle.

Repeat above 4 steps with the compass set at 2.5 cm

Question:3 Draw a circle and any two of its diameters. If you join the ends of these diameters, what is the figure obtained? What figure is obtained if the diameters are perpendicular to each other? How do you check your answer?

Answer: By joining the ends of the two diameters, we get a rectangle.

Therefore, by measuring, we find that and , i.e, pairs of opposite sides are equal and also $\angle A = \angle B = \angle C = \angle D = 90^{\circ}$ .

and each angle is fo $90^{\circ}.$

Hence, it is a rectangle:

If the diameters are perpendicular to each other, then by joining the ends of two diameters, we get a square.

Then, by measuring the length of the side we find that . that is all sides are of same length also, $\angle A = \angle B = \angle C = \angle D = 90^{\circ}$ , that is each angle is $90^{\circ}.$

Hence, it is a square:

Question: 4 Draw any circle and mark points A, B, and C such that

(a) A is on the circle. (b) B is in the interior of the circle.
(c) C is in the exterior of the circle.

Answer: To draw the circle with the given conditions:

First, mark point 'O' as the centre and place the pointer of the compasses at 'O' then turn the compasses slowly to complete the circle.

Now, mark point A on the circle, mark the point 'B' in the interior of the circle, also point 'C' exterior to the circle.

Question: 5 Let A, B be the centres of two circles of equal radii; draw them so that each one of them passes through the centre of the other. Let them intersect at C and D. Examine whether $\overline{AB}$ and $\overline{CD}$ are at right angles.

Answer: First, draw two circles of equal radii taking A and B as their centre and they intersect at C and D. Then, join AB and CD.

From the figure, AB and CD intersect at right angle with

NCERT class 6 maths chapter 14 practical geometry exercise 14.2

Question: 1 Draw a line segment of length 7.3 cm using a ruler.

Answer: Let the line segment be 'AB':

Then, follows these steps:

(i) Place the zero mark of the ruler at a point A.

(ii) Mark point B at a distance of 7.3cm from A.

(iii) Now, join AB.

Then, AB is the required line segment of the length of 7.3 cm.

Question: 2 Construct a line segment of length 5.6 cm using ruler and compasses.

Answer:

(i) Draw a line ′l′. Mark a point A on this line.

(ii) Place the compasses pointer on the zero mark of the ruler. Open it to place the pencil point up to 5.6 cm mark.

(iii) Without changing the opening of the compasses. Place the pointer on A and cut an arc at B on line l.

$\bar{AB}$ is the required line segment of length 5.6 cm.

Question: 3 Construct AB of length 7.8 cm. From this, cut off $\overline{AB}$ of length 4.7 cm. Measure $\overline{BC}$ .

Answer: The steps of constructions:

(i) Place the zero mark of the ruler at A.

(ii) Mark a point B at a distance 7.8 cm from A.

(iii) Again, mark a point C at a distance 4.7 from A.

By measuring $\bar{BC}$ , we find that BC = 3.1 cm

Question: 4 Given $\overline{AB}$ of length 3.9 cm, construct $\overline{PQ}$ such that the length of $\overline{PQ}$ is twice that of $\overline{AB}$ . Verify by measurement.

( Hint : Construct $\overline{PX}$ such that length of $\overline{PX}$ = length of $\overline{AB}$ ; then cut off $\overline{XQ}$ such that $\overline{XQ}$ also has the length of $\overline{AB}$ .)

Answer: The steps of constructions are following:

(i) Draw a line ′l′.

(ii) Construct $\bar{PX}$ such that length of $\bar{PX}$ = length of $\bar{AB}$

(iii) Then cut of $\bar{XQ}$ such that $\bar{XQ}$ also has the length of $\bar{AB}$ .

(iv) Thus the length of $\bar{PX}$ and the length of $\bar{XQ}$ added together make twice the length of $\bar{AB}$ .

Verification :

By measurement we find that PQ = 7.8 cm

= 3.9 cm + 3.9 cm = $\bar{AB} + \bar{AB}$ = $2\times\bar{AB} .$

Question: 5 Given $\overline{AB}$ of length 7.3 cm and $\overline{CD}$ of length 3.4 cm, construct a line segment $\overline{XY}$ such that the length of $\overline{XY}$ is equal to the difference between the lengths of $\overline{AB}$ and $\overline{CD}$ . Verify by measurement .

Answer: The steps of construction are as follows:

(i) Draw a line ′l′ and take a point X on it.

(ii) Construct $\bar{XZ}$ such that length $\bar{XZ}$ = length of $\bar{AB}$ = 7.3 cm

(iii) Then cut off $\bar{ZY}$ = length of $\bar{CD}$ = 3.4 cm

(iv) Thus the length of $\bar{XY}$ = length of $\bar{AB}$ – length of $\bar{CD}$

Verification :

By measurement we find that length of $\bar{XY}$ = 3.9 cm

$= 7.3 cm - 3.4cm = \bar{AB} - \bar{CD}$

NCERT class 6 maths chapter 14 practical geometry exercise 14.3

Question: 1 Draw any line segment $\overline{PQ}$ . Without measuring $\overline{PQ}$ , construct a copy of $\overline{PQ}$ .

Answer: The steps of constructions are the following:

(i) Given $\bar{PQ}$ whose length is not known.

(ii) Fix the compasses pointer on P and the pencil end on Q. The opening of the instrument now gives the length of $\bar{PQ}$ .

(iii) Draw any line . Choose a point A on . Without changing the compasses setting, place the pointer on A.

Draw an arc that cuts at a point, say B. Now $\bar{AB}$ is a copy of $\bar{PQ}$ .

Question:2 Given some line segment $\overline{AB}$ , whose length you do not know, construct $\overline{PQ}$ such that the length of $\overline{PQ}$ is twice that of $\overline{AB}$ .

Answer: The steps of construction are followings:

(i) Given $\bar{AB}$ whose length is not known.

(ii) Fix the compasses pointer on A and the pencil end on B. The opening of the instrument now gives the length of $\bar{AB}$ .

(iii) Draw any line . Choose a point P on . Without changing the compasses setting, place the pointer on Q.

(iv) Draw an arc that cuts at a point R.

(v) Now place the pointer on R and without changing the compasses setting, draw another arc that cuts at a point Q.

Thus $\bar{PQ}$ is the required line segment whose length is twice that of AB.

NCERT class 6 maths chapter 14 practical geometry exercise 14.4

Question: 1 Draw any line segment $\overline{AB}$ . Mark any point M on it. Through M, draw a perpendicular to $\overline{AB}$ . (use ruler and compasses)

Answer: The steps of constructions are the following:

(i) With M as the centre and a convenient radius, draw an arc intersecting the line AB at two points C and B.

(ii) With C and D as centres and a radius greater than MC, draw two arcs, which cut each other at P.

(iii) Join PM. Then PM is perpendicular to AB through point M.

Question: 2 Draw any line segment $\overline{PQ}$ . Take any point R not on it. Through R, draw a perpendicular to $\overline{PQ}$ . (use ruler and set-square)

Answer: The steps of constructions are:

(i) Place a set-square on such that one arm of its right angle aligns along .

(ii) Place a ruler along the edge opposite to the right angle of the set-square.

(iii) Hold the ruler fixed. Slide the set square along the ruler till the point R touches the other arm of the set square.

(iv) Join RM along the edge through R meeting at M. Then RM ⊥ PQ.

Question: 3 Draw a line l and a point X on it. Through X, draw a line segment $\overline{XY}$ perpendicular to l . Now draw a perpendicular to $\overline{XY}$ at Y. (use ruler and compasses)

Answer: The steps of construction are as follows:

(i) Draw a line and take point X on it.

(ii) With X as the centre and a convenient radius, draw an arc intersecting the line at two points A and B.

(iii) With A and B as centres and a radius greater than XA, draw two arcs, which cut each other at C.

(iv) Join AC and produce it to Y. Then XY is perpendicular to .

(v) With Y as the centre and a convenient radius, draw an arc intersecting XY at two points C and D.

(vi) With C and D as centres and radius greater than YD, draw two arcs which cut each other at F.

(vii) Join YF, then YF is perpendicular to XY at Y.

NCERT class 6 maths chapter 14 practical geometry exercise 14.5

Question: 1 Draw $\overline{AB}$ of length 7.3 cm and find its axis of symmetry.

Answer: The axis of symmetry of the line segment $\bar{AB }$ will be the perpendicular bisector of $\bar{AB }$ . So, draw the perpendicular bisector of AB.

The steps of constructions are as follows:

(i) Draw a line segment $\bar{AB }$ = 7.3 cm

(ii) Taking A and B as centres and radius more than half of AB, draw two arcs which intersect each other at C and D.

(iii) Join CD. Then CD is the axis of symmetry of the line segment AB.

Question: 2 Draw a line segment of length 9.5 cm and construct its perpendicular bisector.

Answer: The steps of constructions are:

(i) Draw a line segment $\bar{AB}$ = 9.5 cm

(ii) Taking A and B as centres and radius more than half of AB, draw two arcs which intersect each other at C and D.

(iii) Join CD. Then CD is the perpendicular bisector of $\bar{AB}$ .

Question:3 Draw the perpendicular bisector of XY whose length is 10.3 cm. (a) Take any point P on the bisector drawn. Examine whether PX = PY. (b) If M is the midpoint of XY, what can you say about the lengths MX and XY?

Answer: Follow the steps to draw the perpendicular bisector of a line XY.

a) PX= PY

b)MX=MY

Question: 4 Draw a line segment of length 12.8 cm. Using compasses, divide it into four equal parts. Verify by actual measurement.

Answer: The steps of constructions are:

(i) Draw a line segment AB = 12.8 cm

(ii) Draw the perpendicular bisector of $\bar{AB}$ which cuts it at C. Thus, C is the mid-point of $\bar{AB}$ .

(iii) Draw the perpendicular bisector of $\bar{AC}$ which cuts it at D. Thus D is the mid-point of .

(iv) Again, draw the perpendicular bisector of $\bar{CB}$ which cuts it at E. Thus, E is the mid-point of $\bar{CB}$ .

(v) Now, point C, D, and E divide the line segment $\bar{AB}$ in the four equal parts.

(vi) By actual measurement, we find that

$\bar{AD} = \bar{DC} = \bar{CE} = \bar{EB} = 3.2cm$

Question: 5 With PQ of length 6.1 cm as diameter, draw a circle.

Answer: The steps of constructions are:

(i) Draw a line segment $\bar{PQ}$ = 6.1 cm.

(ii) Draw the perpendicular bisector of PQ which cuts, it at O. Thus O is the mid-point of $\bar{PQ}$ .

Taking O as the centre and OP or OQ as radius draw a circle where the diameter is the line segment $\bar{PQ}$ .

Question: 6 Draw a circle with centre C and radius 3.4 cm. Draw any chord $\overline{AB}$ . Construct the perpendicular bisector of $\overline{AB}$ and examine if it passes through C.

Answer: The steps of constructions are:

(i) Draw a circle with centre C and radius 3.4 cm.

(ii) Draw any chord $\bar{AB}$ .

(iii) Taking A and B as centres and radius more than half of $\bar{AB}$ , draw two arcs which cut each other at P and Q.

(iv) Join PQ. Then PQ is the perpendicular bisector of $\bar{AB}$ .

This perpendicular bisector of $\bar{AB}$ passes through the centre C of the circle.

Question: 7 Repeat Question 6, if AB happens to be a diameter.

Answer: The steps of constructions are:

(i) Draw a circle with centre C and radius 3.4 cm.

(ii) Draw its diameter $\bar{AB}$

(iii) Taking A and B as centres and radius more than half of it, draw two arcs which intersect each other at P and Q.

(iv) Join PQ. Then PQ is the perpendicular bisector of $\bar{AB}$

We observe that this perpendicular bisector of $\bar{AB}$ passes through the centre C of the circle.

Question: 8 Draw a circle of radius 4 cm. Draw any two of its chords. Construct the perpendicular bisectors of these chords. Where do they meet?

Answer: The steps of constructions are:

(i) Draw the circle with O and radius 4 cm.

(ii) Draw any two chords $\bar{AB}$ and $\bar{CD }$ in this circle.

(iii) Taking A and B as centres and radius more than half AB, draw two arcs which intersect each other at E and F.

(iv) Join EF. Thus EF is the perpendicular bisector of chord $\bar{CD }$ .

(v) Similarly draw GH the perpendicular bisector of chord $\bar{CD }$ .

These two perpendicular bisectors meet at O, the centre of the circle.

Question:9 Draw any angle with vertex O. Take a point A on one of its arms and B on another such that OA = OB. Draw the perpendicular bisectors of $\overline{OA}$ and $\overline{OB}$ . Let them meet at P. Is PA = PB ?

Answer: The steps of constructions are:

(i) Draw any angle with vertex O.

(ii) Take a point A on one of its arms and B on another such that

(iii) Draw perpendicular bisector of $\bar{OA}$ and $\bar{OB}$ .

(iv) Let them meet at P. Join PA and PB.

With the help of divider, we obtained that $\bar{PA} = \bar{PB}.$

NCERT class 6 maths chapter 14 practical geometry topic 14.5.4 angles of special measures

Question: How will you construct a 15° angle?

Answer: First, we make $30^{\circ},$ and then its bisector.

The steps of constructions are:

1. Draw a ray OA.

2. Taking O as the center and any radius of your own choice, draw an arc cutting OA at B.

3. Now, taking B as center and with the same radius as before, draw an arc intersecting the previously drawn arc at point C.

4. Draw the ray OD passing through the C.

Thus, $\angle AOD = 60^{\circ}$

Now, we draw bisector of $\angle AOD$

5. Taking C and D as the center, with radius more than $\frac{1}{2}CD$ , draw arcs intersecting at E.

6. Join OE.

Thus, $\angle AOE = 30^{\circ}$

Now, we draw the bisector of $\angle AOD$

7. Mark point P where the ray OE intersects the arc.

8. Taking P and B as center, with having the radius more than $\frac{1}{2}PB$ , draw arcs intersecting at F.

9. Join OF

Thus, $\angle AOF = 15^{\circ}.$

Question: How will you construct a 150° angle?

Answer: Take a line segment, say, AB.

Choose a point C on it.

With center C, and radius BC, draw an arc.

With center B and radius BC, cut the previous arc at say DD.

$(\angle DCB=60^{\circ}\ because\ we\ just\ made\ CD=BC=BD )$

With center D, and radius BC draw an arc.

With center B and radius BC, cut this arc at, say, EE.

Then EC is the bisector of ∠BCD, and

Hence, $\angle BCE=30^{\circ}$

Then, $\angle ACE=180^{\circ} - \angle BCE=150^{\circ}$

Question: How will you construct a 45° angle?

Answer: The steps of constructions:

1. Draw a ray OA.

2. Taking O as center and any radius, draw an arc cutting OA at B.

3. Now, taking B as center and with the same radius as before, draw an arc intersecting the previously drawn arc at point C.

4. With C as the center and the same radius, draw an arc cutting the arc at D.

5. With C and D as centers and radius more than $\frac{1}{2}CD$ , draw two arcs intersecting at P.

6. Join OP.

Thus, $\angle AOP = 90^{\circ}$

Now, we draw the bisector of $\angle AOP$

7. Let OP intersects the original arc at point Q.

8. Now, taking B and Q as centers, and radius greater than $\frac{1}{2}BQ,$ draw two arcs intersecting at R.

9. Join OR.

Thus, $\angle AOR = 45^{\circ}$

NCERT class 6 maths chapter 14 practical geometry exercise: 14.6

Question: 1 Draw $\angle$ POQ of measure 75° and find its line of symmetry.

Answer: Here, we will draw $75^{\circ}$ using a protractor.

We follow these steps:

1. Draw a ray OA.

2. Place the centre of the protractor on point O, and coincide line OA and Protractor line

3. Mark point B on 75 degrees.

4. Join OB

Therefore $\angle AOB = 75^{\circ}$

Now, we need to find its line of symmetry

that is, we need to find its bisector.

We follow these steps

1. Mark points C and D where the arc intersects OA and OB

2. Now, taking C and D as centres and with the radius more than $\frac{1}{2}CD$ , draw arcs to intersects each other.

3. Let them intersects at point E.

4. Join O and E.

Therefore OE is the line of symmetry of $\angle BOA = 75^{\circ}$

Question: 2 Draw an angle of measure 147° and construct its bisector.

Answer: The steps of constructions are:

1. Draw a line OA.
2. Using protractor and centre 'O draw an angle AOB =147°.
3. Now taking 'O' as the centre and any radius draws an arc that intersects 'OA' and 'OB' at p and q.
4. Now take p and q as centres and radius more than half of PQ, draw arcs.
5. Both the arcs intersect at 'R'
6. Join 'OR' and produce it.
7. 'OR' is the required bisector of angle AOB.

Question: 3 Draw a right angle and construct its bisector.

Answer: The steps of construction:

(a) Draw a line PQ and take a point O on it.

(b) Taking O as the centre and convenient radius, draw an arc that intersects PQ at A and B.

(d) Join OC. Thus, ∠COQ is the required right angle.

(e) Taking B and E as centre and radius more than half of BE, draw two arcs that intersect each other at point D.

(f) Join OD. Thus, the OD bar is the required bisector of ∠COQ.

Question: 4 Draw an angle of measure 153° and divide it into four equal parts.

Answer: The steps of constructions are:

(a) Draw a ray OA.

(b) At O, with the help of a protractor, construct ∠AOB = 153 degrees.

(d) Again, draw OD as bisector of ∠AOC.

(e) Again, draw OE as bisector of,∠BOC.

(f) Thus, OC, OD, and OE divide ∠AOB into four equal parts.

Question: 5(a) Construct with ruler and compasses, angles of following measures:

60 o

Answer: The steps of constructions are:

1. Draw a ray OA

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at P.

3. Taking P as the centre and the same radius, cut the previous arc at Q. Join OQ. Thus,∠BOA is the required angle of 60°

Question:5(b) Construct with ruler and compasses, angles of following measures:

30 o

Answer: The steps of constructions are:

1. Draw a ray OA.

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at P.

3. Taking P as the centre and the same radius, cut the previous arc at Q. Join OQ. Thus, ∠BOA is the required angle of 60°.

4. Put the pointer on P and mark an arc.

5. Put the pointer on Q and with the same radius, cut the previous arc at C. Thus, ∠COA is required angle of 30°

Question: 5(c) Construct with ruler and compasses, angles of following measures:

90 o

Answer: The steps of constructions are:

1. Draw a ray OA

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at X.

3. Taking X as the centre and the same radius, cut the previous arc at Y. Taking Y as the centre and the same radius, draw another arc intersecting the same arc at Z.

4. Taking Y and Z as centres and the same radius, draw two arcs intersecting each other at S.

5. Join the OS. Thus, ∠SOA is a required angle of 90°

Question: 5(d) Construct with ruler and compasses, angles of following measures:

120 o

Answer: The steps of constructions are:

1. Draw a ray OA

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at P.

3. Taking P as the centre and same radius, cut previous arc at Q. Taking Q as the centre and the same radius cut the arc at S. Join OS. Thus, ∠AOS is the required angle of 120°.

Question:5(e) Construct with ruler and compasses, angles of following measures:

45 o

Answer: The steps of constructions are:

1. Draw a ray OA

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at X.

3. Taking X as the centre and the same radius, cut the previous arc at Y. Taking Y as the centre and the same radius, draw another arc intersecting the same arc at Z.

4. Taking Y and Z as centres and the same radius, draw two arcs intersecting each other at S. Join OS. Thus, ∠SOA is a required angle of 90°.

5. Draw the bisector of SOA. Hence, ∠MOA = 45°

Question: 5(f) Construct with ruler and compasses, angles of following measures:

135 o

Answer: The steps of constructions are:

1. Draw a line PQ and take a point O on it.

2. Taking O as the centre and convenient radius, mark an arc, which intersects PQ at A and B.

3. Taking A and B as centres and radius more than half of AB, draw two arcs intersecting each other at R. Join OR. Thus, ∠QOR = ∠POR = 90°.

4. Draw OD the bisector of ∠POR. Thus, ∠QOD is required angle of 135°

Question: 6 Draw an angle of measure 45° and bisect it.

Answer: The steps of constructions are:

1. Draw a ray OA

2. Taking O as the centre and convenient radius, mark an arc, which intersects OA at X.

3. Taking X as a centre and the same radius, cut the previous arc at Y. Taking Y as the centre and the same radius, draw another arc intersecting the same arc at Z.

4. Taking Y and Z as centres and the same radius, draw two arcs intersecting each other at S. Join OS. Thus, ∠SOA is a required angle of 90°.

5. Draw the bisector of ∠SOA. Hence, ∠MOA = 45°

6. Draw the bisector of ∠MOA. Hence, ∠NOA= 22.5 0

Question: 7 Draw an angle of measure 135° and bisect it.

Answer: The steps of constructions are:

(a) Draw a line PQ and take a point O on it.

(b) Taking O as the centre and convenient radius, mark an arc, which intersects PQ at A and B.

(d) Join OR. Thus, ∠QOR = ∠POQ = 90 .

(e) Draw OD the bisector of ∠POR. Thus, ∠QOD is the required angle of 135.

(f) Now, draw OE as the bisector of ∠QOD=1/2 of 135=67.5

Question: 8 Draw an angle of 70 o . Make a copy of it using only a straight edge and compasses.

Answer: The steps of constructions are:

(a) Draw an angle 70 degrees with a protractor, i.e., ∠POQ = 70 degrees

(b) Draw a ray AB.

(d) Use the same compasses, setting to draw an arc with A as the centre, cutting AB at X.

(e) Set your compasses setting to the length LM with the same radius.

(f) Place the compasses pointer at X and draw the arc to cut the arc drawn earlier at Y.

(g) Join AY. Thus, ∠YAX = 70 degree

Question: 9 Draw an angle of 40 o . Copy its supplementary angle.

Answer:

The steps of constructions are:

(a) Draw an angle of 40 degrees with the help of protractor, naming ∠ AOB.

(b) Draw a line PQ.

(d) Place the compasses at O and draw an arc to cut the rays of ∠AOB at L and N.

(e) Use the same compasses setting to draw an arc O as the centre, cutting MQ at X.

(f) Set your compasses to length LN with the same radius.

(g) Place the compasses at X and draw the arc to cut the arc drawn earlier Y.

(h) Join MY.

(i) Thus, < QMY = 40 degree and < PMY is supplementary of it.

Chapter No.	Chapter Name
Chapter 1	NCERT Solutions for class 6 maths chapter 1 Knowing Our Numbers
Chapter 2	NCERT solutions for class 6 maths chapter 2 Whole Numbers
Chapter 3	NCERT solutions for class 6 maths chapter 3 Playing with Numbers
Chapter 4	NCERT Solutions for class 6 maths chapter 4 Basic Geometrical Ideas
Chapter 5	NCERT solutions for class 6 maths chapter 5 Understanding Elementary Shapes
Chapter 6	NCERT solutions for class 6 maths chapter 6 Integers
Chapter 7	NCERT Solutions for class 6 maths chapter 7 Fractions
Chapter 8	NCERT solutions for class 6 maths chapter 8 Decimals
Chapter 9	NCERT solutions for class 6 maths chapter 9 Data Handling
Chapter 10	NCERT solutions for class 6 maths chapter 10 Mensuration
Chapter 11	NCERT Solutions for class 6 maths chapter 11 Algebra
Chapter 12	NCERT solutions for class 6 maths chapter 12 Ratio and Proportion
Chapter 13	NCERT solutions for class 6 maths chapter 13 Symmetry
Chapter 14	NCERT Solutions for class 6 maths chapter 14 Practical Geometry

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NCERT class 6 maths chapter 14 practical geometry exercise 14.1

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NCERT class 6 maths chapter 14 practical geometry exercise 14.5

NCERT class 6 maths chapter 14 practical geometry topic 14.5.4 angles of special measures

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