Question

find the area of circle whose radius is 21/2 ​

Answer 1

Radius, r= 21/2

Area of the circle = πr²

= 22/7 * 21/2 * 21/2

= 33*21/2 = 341.5

Answer 2

area of the circle =πr^2

=22/7×21/2×21/2=346.5 unit. sq