Question

find the area of the circle whose dia metre are given is 7 cm

Answer 1

area = πr2
=22/7•7/2•7/2
=11•3.5
= 38.5 cm2

Answer 2

d=2r
and r=d/2=7/2=3.5
area of circle =πr^2
22/7×3.5×3.5
22×0.5×3.5
11×3.5=38.5