Circle Theorems

Question

Anatoli is making a cement step for his patio in the shape of a sector of a circle. He has enough cement to fill an area of 3.6 square meters (m^2) such that the central angle is 1.2 radians. What must be the radius of the circular sector?

Answer 1

A = (1/2)r²θ

So, 3.6 = (1/2)r²(1.2)

r² = 6

r = √6