Question

The volume of a cylinder having a base radius of 3 cm is 396 cm³. Find its curved surface area (in cm²). (Use $\pi = \frac{22}{7}$).

• A. 280
• B. 301.5
• C. 264
• D. 320.6

Answer 1

Answer: (B)

301.5

Answer 2

The volume of the cylinder is given by $V = \pi r^2 h$: $396 = \frac{22}{7} \times 3^2 \times h \Rightarrow h = \frac{396 \times 7}{22 \times 9} = 7$ cm. The curved surface area is $CSA = 2\pi rh = 2 \times \frac{22}{7} \times 3 \times 7 = 301.5$ cm².