Question

Find the exact area of a circle having the given circumference.

3pi

Answer 1

Aaaaaaaargh!

Answer 2

Oops, typed it wrong 2*pi*r

Answer 3

i trieddoing it myself i have i did 2*3.14*3 and it gaint 18.84

Answer 4

Third time lucky...."exact" means leave pi as pi.

Answer 5

to get the radius,
2*pi*r=3pi
r =(3pi)/(2pi) {cancel pi and pi)
so r = 3/2

area=pi*r^2
area=(22/7)*(3/2)*(3/2)
area=(11/7)*3*(3/2)
area=99/14
area = 7.07