What is the radius of the circle that has an area of 81*x*pi degrees

Question

What is the radius of the circle that has an area of
`81*x*pi` degrees

Answer 1

R=9

Explanation:

the formula for area of a circle is pi r squared

where r denotes the radius of the circle

equating the formula for area with the area of the circle provided

p\i r squared = 81 p\i

r squared = 81

r = radical 81

r =9 inches