The area of a sector is 18π cm², and its radius is 6 cm. What is the central angle (in radians)?
Show answer & explanation
Correct answer: A
Explanation
Area = 18π, radius = 6
Area = (1/2) r²θ
18π = (1/2) × 6² × θ
= (1/2) × 36 × θ= 18θ
18π = 18θ
θ = π