Question

formula of area related to circle

Answer 1

hey mate...

here is your answer..

area of circle=
$\pi \: r {}^{2}$
for semicircles=
$\pi \: r {}^{2} \div 2$
area of quadrant =
1/4×πr^2
hope it helps you...

Answer 2

πrsq..
pie ×radius×radius