ML AGGARWAL CLASS 8 Chapter 16 Symmetry Reflection and Rotation Exercise 16.1

 Exercise 16.1

Question 1

Sol :
(i) One 

(ii) One 

(iii) Zero 

(iv) Four

(v) Three

(vi) Four

Question 2

Sol :

(i) zero

(ii) zero

(iii) Two

(iv) Four

(v) Three

(vi) Four

Question 3

Sol :

Given 

AB=5.3cm

BC=3 cm

1. Draw straight line AB=5.3 cm

2.Draw 90 line to AB at point B

3. Cut at a distance BC = 3cm and note the point 'C'

4.Now drew 5.3cm are from C and 3cm arc from A , Intersection point is D.

5. Join CD and AD. Then ABCD is a required rectangle

$\Rightarrow$ Two symmetry lines

Question 4

Sol :

Given

AB=5.3 cm

$\angle A=60^{\circ}$

1.Draw AB = 5.3cm

2.At A, construct $\angle B A P=60^{\circ}$

3.From AP, Cut off AD = 5.3cm, draw aware.

4.With D as centre and radius 5.3cm , draw aware to meet the previous arc at C

5.Join BC and CD. Then ABCD is the required rhombus.