Question

Find the radius of a circle with an area of 27 pie cm

Answer 1

F 3 sqrt(3)

Explanation:

The area of a circle is given by

A = pi*r^2

We know the area is 27*pi

27 *pi = pi*r^2

Divide each side by pi

27 *pi/pi = pi/pi*r^2

27 = r^2

Take the square root of each side

sqrt(27) = sqrt(r^2)

sqrt(9*3) = r

sqrt(9) sqrt(3) = r

3sqrt(3) =r

Answer 2

Area of a circle is = PI x r^2

Area = 27 PI

This means the radius would be the square root of 27:

√27 = 3√3

The answer is F.