Question

find area of circle whose circumference is 132 CM

Answer 1

at first radius=C/2*22/7=132/2*22/7=21
then area=22/7*21^2=1386

Answer 2

$2\pi \: r = 132cm \\ r \: = 132 \div (44 \div 7) \\ r \: = 21cm \\ so \: = \pi \: r {}^{2} = (22 \div 7) \times 21 \times 21 = 1386cm {}^{2}$