Question

The circular portions of the following figures are
6.
semicircles. For each of the following figures, find
(1) its perimeter,
(ii) its area.
​

Answer 1

Answer:

The figure contains a semi-circle and a rectangle.

Area of rectangle =10.2×1.5=15.3cm

2

From figure,

Diameter of semicircle =10.2−3.9=6.3cm

So, Radius

2

6.3

==3.15cm

So, Area of semi-circle

=

2

1

πr

2

=

7

22

×

2

1

×3.15×3.15=15.59cm

2

Therefore, total area =15.3+15.59=30.89cm

2

.