If the radius of a cylinder is 7 m and its total surface area is 440 m2, then find the height of the cylinder.
Show answer & explanation
Correct answer: C
Explanation
The Correct answer is Option 3 i.e. 3 m.
We know that,
T.S.A = 2πr (h + r)
given that, r = 7 m
⇒ 440 = 2 × 22/7 × 7 × (h + 7)
⇒ (440 × 7)/(2 × 22 × 7) = h + 7
⇒ 10 = h + 7
⇒ h = 10 - 7 = 3 m