A sector of a circle having a radius of 7 cm has an area of 77 cm2. Find the angle of the sector.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 180°
Area of sector = (θ/360)πr2 = 77
⇒ (θ/360) × (22/7) × 7 × 7 = 77
⇒ θ/360 = 1/2
⇒ θ = 360 × (1/2) = 180°