Question 40
Mensuration of SolidsA cone is made from a sector of a circle of radius 14cm and angle of 90°. What is the area of the curved surface of the cone? (Take π = 22/7)
- A.22cm2
- B.38.5cm2
- C.77cm2
- D.154cm2
- E.308cm2
Show the answer and explanation
Answer: D (154cm2)
Explanation
The curved surface of the cone is the sector itself: 90/360 × 22/7 × 142 = 154 cm².