Question

the lateral or curved surface area of a closed cylindrical petrol Storage tank that is 4.2 m in diameter and 4.5 M height find its curved surface area

Answer 1

Curved surface area of cylinder =2*pie*r*h
r=4.2/2 m
r=2.1 m
Curved surface area =(2*22*2.1*4.5)/7
=》 415.8/7 sq. m
=》59.4 sq. m

Answer 2

If diameter = 4.2m
then radius = 4.2m ÷ 2
= 2.1m
Height = 4.5m
then
Curved Surface Area = 2πrh
= 2×22÷7×2.1×4.5
= 2×22×0.3×4.5
= 44×1.35
=59.4m
So Curved Surface Area is 59.4m