Question 39
Mensuration of Plane ShapesIn the diagram, O is the centre of the circle of radius 18 cm. If ∠ZXY = 70°, calculate the length of arc ZY. [Take π = 22/7]
- A.11 cm
- B.22 cm
- C.44 cm
- D.80 cm
Show the answer and explanation
Answer: C (44 cm)
Explanation
The angle at the centre is twice the angle at the circumference: ∠ZOY = 140°. Arc = (140/360) × 2 × (22/7) × 18 = 44 cm.