Question

What is the circumference of a circle with an area of 64(pi) in^2 ?
a. 8(pi)in
b. 16(pi)in
c. 1024(pi)in
d. 32(pi)in
e. none of these

Answer 1

can you recall the formula in finding area and circumference of a circle?

Answer 2

circumference= 2 pi r

Answer 3

2 pi r

Answer 4

can you show me the work leading to the answer?

Answer 5

that's for circumference. for area, it's pi r squared. since you're given the area of the circle, substitute it to the formula for area. what you've got?

Answer 6

A is the ans
Area= pi x r^2
64= pi x r^2
r=8 pi

Answer 7

what's the value of your 'r'?

Answer 8

nice work @cj49

Answer 9

lol thnx mate @princeharryyy

Answer 10

:p

Answer 11

A=(pi)*r^2
C=2(pi)r
since you're given the area to be 64 pi, then using the area formula, you'll get the value of r as 8.. substitute the value to the formula in finding circumference. then you'll have 2(pi)*8. therefore your circumference is 16 pi.