Question 29
Mensuration of Plane ShapesIf the angle of a sector of a circle with radius 10.5 cm is 120°, find the perimeter of the sector. [π = 22/7]
- A.48 cm
- B.40cm
- C.43cm
- D.45cm
Show the answer and explanation
Answer: C (43cm)
Explanation
Arc length = (120/360) × 2 × (22/7) × 10.5 = 22 cm. Perimeter = 22 + 2 × 10.5 = 43 cm.