What is the exact area of a circle with a diameter of 18 feet?

A.
36π square feet

B.
81π square feet

C.
324π square feet

D.
1296π square feet

Question

What is the exact area of a circle with a diameter of 18 feet?	
 
 A.
36π square feet
 
 B.
81π square feet
 
 C.
324π square feet
 
 D.
1296π square feet

anonymous · Answer

@DARTHVADER2900

anonymous · Answer

Hello, i think i can help, im learning this subject right now.

darthvader2900 · Answer

B probably.

anonymous · Answer

@DARTHVADER2900  Please dont give direct answers, though they could be wrong and it is against the rules.

anonymous · Answer

im fine with answers but i would like how u got it

anonymous · Answer

Don't worry Colby, Im thinking.

darthvader2900 · Answer

area = pi (r^2)

anonymous · Answer

Im looking through my notes, i did this last week. sorry imma take a sec.

darthvader2900 · Answer

what is the radius given the diameter of 18?

anonymous · Answer

np take ur time im helping some one else with circumference

anonymous · Answer

Nvm, seems like Darthhas got this, Bye! =-) Good luck

anonymous · Answer

it would be half right so 9

darthvader2900 · Answer

Yes, so now plug it into the formula. |dw:1460646881226:dw|

anonymous · Answer

what do u do with the pie