Question

Find the area of circle whose circumference is the same as the perimeter of a rectangle of side 30cm and cm.

Answer 1

Ans = circumference of circle = perimeter of rectangle

Circumference of circle = 2πr

30 = 2πr

30×7 = 2×22×r

210^44 = r

4.78 = r

Area of circle = π×r×r

= 22^7×4.78×4.78

= 502.66^7

= 71.80 cm×cm