The volume of a cylinder of radius 14cm is 210cm3. What is the curved surface area of the cylinder?
- 15cm2
-
30cm2
- 616cm2
- 1262cm2
The correct answer is: B
Explanation
\(V = \pi r^2 h\\
210 = \frac{22}{7} \times 14^2 \times h \\
h = \frac{210}{22 \times 28}\)
Curved surface area \(= 2\pi rh\\
= 2 \times \frac{22}{7} \times 14 \times \frac{210}{22 \times 26} = 30cm^2\)