Question

what is the area of a circle whose diameter equals 8m?

a.) 64 π mm²
b.) 8 π mm²
c .) 16 π mm²
d.) 32 π mm²
e.) none of the above

Answer 1

Area of circle = πr²
Diameter = 2r

Answer 2

8= 2r
r=4
Now plug into the formula: A= πr²
A= π(4)²
A= 16π
Answer: c .) 16 π mm²

Answer 3

excuse me , how did you get 16 ? ;o

Answer 4

(4)² = 4*4 = 16

Answer 5

i get it now , thanks c: