Question 24
Mensuration of SolidsA sector of a circle of radius 7.2cm which subtends an angle of 300° at the centre is used to form a cone. What is the radius of the base of the cone?
- A.6cm
- B.7cm
- C.8cm
- D.9cm
Show the answer and explanation
Answer: A (6cm)
Explanation
The arc length becomes the base circumference: (300/360) × 2π × 7.2 = 2πr. So r = 7.2 × 300/360 = 6 cm.