Question

The volume of a right circular cylinder is 1100 cm3 and the radius of its base is 5 cm. Calculate its curved surface area.

(A) 410 cm2 (B) 125 cm2 (C) 440 cm2

Answer 1

(A) 440 cm²

Explanation:

Volume of a right circular cylinder = 1100 cm²

πr2 h = 1100 cm³

Here r = 5

(22/7) ⋅ (5)2 ⋅ h = 1100

h = 2/7

Curved surface area of cylinder = 2 πr h

= 2 ⋅ (22/7) ⋅ 5 ⋅ (2/7)

= 440 cm²

So, the curved surface area of cylinder is 440 cm²

Answer 2

• (C) 440 cm²

Explanation:

Volume:

• V = πr²h

Given r = 5 cm and V = 110 cm³, find h:

• 1100 = π(5²)h
• 1100/25 = πh
• 44 = πh

Curved surface area:

• S = 2πrh = 2*5*πh = 10*44 = 440 cm²

Correct choice is C