It is required to make a closed cylindrical tank

Asked by admin @ in Math viewed by 271 People

"Question 2 It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square meters of the sheet are required for the same?

Class 9 - Math - Surface Areas and Volumes Page 216"

Answered by admin @


Let r be the radius of the base and h be the height of the cylinder.

Base diameter = 140 cm and Height (h) = 1m

Radius of base (r) = 140/2 = 70 cm = 0.7 m

Metal sheet required to make a closed cylindrical tank = 2πr(h + r)
= (2 × 22/7 × 0.7) (1 + 0.7) m2
=7.48 m2

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