What is the area of a sector of a circle of radius 7 cm and central angle 90°?
Answer & explanation
Correct answer: option 1
Area of sector = \(\frac{θ°}{360°}\) \(\pi \) r2
= \(\frac{90}{360}\) × \(\frac{22}{7}\) × 7 × 7
= \(\frac{1}{4}\) × \(\frac{22}{7}\) × 7 × 7
= 38.5 cm2