Question

The area of circle Z is 64 ft2.

What is the value of r?

r = 4 ft
r = 8 ft
r = 16 ft
r = 32 ft

Answer 1

its 8

Explanation:

i got it right

Answer 2

r=4.51 ft

Explanation:

Area of a circle is given by

`A=\pi r^(2)` where A is area and r is the radius. Making r the subject of the above formula then

`r=\sqrt {\frac {A}{\pi}}`

Substituting A with 64 then

`r=\sqrt {\frac {64}{\pi}}\approx 4.51 ft`