Question

Find the area of a circle whose circumference is 12pi ft.




A.
113.04 square feet



B.
24 square feet



C.
144 square feet



D.
108.12 square feet

Answer 1

help would be greatly appreciated

Answer 2

you start by using the circumference formula

C = 2*pi*r

12*pi = 2*pi*r ... plug in the given circumference

6 = r ... divide both sides by 2pi (to isolate r)

r = 6

now you know the radius is 6 feet

Answer 3

once you find the radius, you can find the area using

A = pi*r^2

Answer 4

im confused

Answer 5

do you see how I got r = 6 ?

Answer 6

yes but how do you multiply r^2

Answer 7

r^2 means r squared

Answer 8

so if r = 6, then r^2 = 6^2 = 6*6 = 36

Answer 9

r = 6
r^2 = 36

Answer 10

ok I know this ^ means square

Answer 11

^ means exponent actually

Answer 12

when you have a 2 after the ^, it means square

^2 means squared

Answer 13

^3 means cubed

etc etc

Answer 14

so the answers a

Answer 15

yep

Answer 16

thanks for your help

Answer 17

np

Answer 18

Find the area of a circle whose circumference is 12pi ft.