Question

It is required to make a closed cylinderical 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 1

Height of cylindrical water tank, h = 1 m 

Diameter of bottom, d = 140 cm.

h = 1 m, d = 140 cm,

Area of metal sheet required to prepare water tank, 

A A = 2πr (r + h)

= 44 × 0.1 × 1.7 

= 4.4 × 1.7 A 

= 7.48 m²