Question

if the area of the circle is 4pi sq. cm, then its radius is : a)1cm b)2cm c)3cm d)4cm​

Answer 1

area = 88/7 cm^2

area of circle = 22/7 × r^2

88/7 = 22r^2/7

r^2 = 88×7/7×22

r^2 = 4

r = 2