Question 40
Mensuration of Plane ShapesThe diagram shows an arc MN of a circle centre O, with radius 10 cm. If ∠MON = 72°, calculate the length of the arc, correct to three significant figures. (Take π = 22/7)
- A.8 cm
- B.12.6 cm
- C.22.6 cm
- D.62.3 cm
Show the answer and explanation
Answer: B (12.6 cm)
Explanation
Arc length = 72/360 × 2 × 22/7 × 10 = 88/7 ≈ 12.6 cm.