What is the exact area of a circle with a radius of cm?

A.

15.5 pi cm²

B.

31 pi cm²

C.

961 pi cm²

D.

240.25 pi cm²

Question

What is the exact area of a circle with a radius of   cm?
  
 
 

 
 

  

  A. 
 
 15.5 pi cm²
   
   

 
 

  

 B. 
 
31 pi  cm²
   
   

 
 

  

 C. 
 
 961 pi cm²
   
   

 
 

  

 D. 
 
240.25 pi  cm²

ipwnbunnies · Answer

$$Area of a circle = \pi r^2$$
For an exact answer, keep pi as pi. :3

anonymous · Answer

ok so wat is it @iPwnBunnies

ipwnbunnies · Answer

Idek. Square the given radius, keep the pi the same. .-.
Do you have a calculator?

triciaal · Answer

i can't read your value for r
use the formula as above  A= pi *r^2
pi is 22/7

anonymous · Answer

im so sorry its 31 @triciaal

triciaal · Answer

do not substitute for pi since pi is in the answer
A = pi (31)^2 = 961 pi  
ans c