Question

Find

(i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m

the diameter and 4.5m high​

Answer 1

Step-by-step explanation:

(i)Diameter of a cylindrical(closed) petrol tank=4.2m

Radius= 4.2/2=2.1 m

Height=4.5 m

Curved Surface area=2πrh=2×22/7×2.1×4.5=59.4sq.m

Hope this is helpful for you.

Answer 2

Diameter = 4.2m

Radius(r) = diameter/2 = 2.1 m

height (h) = 4.5m

Formula :-

Curved surface area of cylinder = 2πrh

Putting values in the formula

We get,

=> 2 × 22/7 × 2.1 × 4.5

=> 2 × 22 × 0.3 × 4.5

=> 44 × 1.35

=> 59.4m²