The curved surface area of a right circular cylinder of height 56cm is 1408 cm2. Find the diameter of the base of the cylinder.
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Correct answer: C
Explanation
The correct answer is option 3 i.e. 0.08 m.
h = 56 cm
Curved surface area = 2πrh = 1408cm2
⇒ 2 × 22/7 × r × 56 = 1408
⇒ r = (1408 × 7)/(2 × 22 × 56)
⇒ r = 4 cm
The diameter d is twice the radius:
d = 2r = 2 × 4 = 8 cm or 8/100 = 0.08 m