Question

 Find the circumference of a circle whose area is 64π cm square.​

Answer 1

Answer:

pi r²=area=64pi

r²=64

r=8

circum=2pi r

=2×3.142×8

Answer 2

Answer:

$16\pi$

Step-by-step explanation:

$area \: of \: circle \: = \: \pi {r }^{2} \\ = > 64\pi \: \: = \: \pi {r}^{2} \\ = > \: \: r \: \: \: = \: \: \sqrt{64} \\ = > r = 8 \\ now \\ circumference \:of \: circle = 2\pi \: r \\ = > \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times \pi \times 8 \\ = > \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 16\pi$