The diameter of the base of a cylindrical vessel is 30 cm and its height is 56 cm. Find its curved surface area (in cm²).

Correct option is C

Radius = Diameter / 2
Radius = 30 cm / 2 = 15.0 cm
CSA = 2πrh
CSA = 2 × π × 15.0 cm × 56 cm
CSA = 2 × $$\frac{22}{7}$$​ × 15.0 cm × 56 cm
CSA = 5280 $$cm^2$$​​