Question 39
Mensuration of Plane ShapesCalculate the length of an arc of a circle of diameter 14 cm, which subtends an angle of 90° at the centre of the circle.
- A.7π/2 cm
- B.7π cm
- C.14π cm
- D.7π/4 cm
Show the answer and explanation
Answer: A (7π/2 cm)
Explanation
r = 7, so the arc = 90/360 × 2π × 7 = 7π/2 cm.