Question

Find
(i)the total surface area of a closed cylindrical petrol storage tank whose diameter 4.2m.and height 4.5m.
(ii) How much steel sheet was actually used,if 1/12 of the steel was wasted in making the tank

Answer 1

Answer:

(I) tsa-2πr(r+h)

radius=4.2÷2=2.1m=r

hieght=h=4.5m

2×π×2.1(2 .1+4.5)

87.0408m²