Question 18
Mensuration of Plane ShapesThe angle of a sector of a circle radius 10.5cm is 120°. Find the perimeter of the sector (Take π = 22/7)
- A.22cm
- B.33.5cm
- C.43cm
- D.66cm
- E.115.5cm
Show the answer and explanation
Answer: C (43cm)
Explanation
Arc = (120/360) × 2 × 22/7 × 10.5 = 22 cm. Perimeter = 22 + 10.5 + 10.5 = 43 cm.