Question 44
Mensuration of SolidsFind the curved surface area of the frustrum in the figure above.
- A.16π√10cm2
- B.20π√10cm2
- C.24π√10cm2
- D.36π√10cm2
Show the answer and explanation
Answer: B (20π√10cm2)
Explanation
The radii are 4cm and 6cm and the height is 6cm, so the slant height is √(62 + 22) = 2√10cm. Curved surface = π(4 + 6) × 2√10 = 20π√10cm2.