Question 49
Mensuration of Plane ShapesWhat is the length of an arc of a circle that subtends 2½ radians at the centre when the radius of the circle is 8cm?
- A.8cm
- B.10cm
- C.40cm
- D.20cm
- E.16cm.
Show the answer and explanation
Answer: D (20cm)
Explanation
With the angle in radians, arc length = radius × angle = 8 × 2½ = 20cm.