Question

A closed metallic cylinder has its base diameter 56cm qnd it is 2.25m high . finr the cost of the metal used to make it if it costs rupees 80 per sq.m

Answer 1

Diameter = 56 cm = 0.56 m
Radius = 0.56/2 = 0.28 m
Height = 2.25 m
TSA of cylinder = Area of metal used
$2\pi \: r(r + h)$

2*22/7*0.28(0.28+2.25)


1.76(2.53)
4.4528
Cost of metal used = ₹ 80*4.4528
=₹354.064