What is the area of a sector of a circle of radius 21 cm and central angle 270°?
Answer & explanation
Correct answer: option 4
Area of sector = \(\frac{θ°}{360°}\) \(\pi \) r2
= \(\frac{270°}{360°}\) × \(\frac{22}{7}\) × 21 × 21
= \(\frac{3}{4}\) × \(\frac{22}{7}\) × 21 × 21
= 1039.5 cm2