What is the area of a sector of a circle of radius 7 cm and central angle 180°?
Answer & explanation
Correct answer: option 2
Area of sector = \(\frac{θ°}{360°}\) \(\pi \) r2
= \(\frac{180°}{360°}\) × \(\frac{22}{7}\) × 7 × 7
= \(\frac{1}{2}\) × \(\frac{22}{7}\) × 7 × 7
= 77 cm2