Question

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 metres of the
sheet are required for the same?
Answer - 7.48 m²​

Answer 1

Answer: here you go !!!

Step-by-step explanation:

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