Question

A storage tank consists of a circular cylinder with a hemisphere stuck on either end. If the external diameter of the cylinder is 1.4m and its length be 8m. find the cost of painting it on the outside at rate of 20 per m²... answer it fast please

Answer 1

Given that, diameter(d) of cylinder is 1.4 m and length(h) is 8 m.
⇒ the radius of sphere(r) = radius of cylinder
⇒ surface area of tank = surface area of cylinder + 2(surface
Area of hemisphere)
= 2πrh + 2(2πr2)
= 2πr(h + 2r)

= 41.36 m2

Answer 2

external diameter of the cylinder is 1.4m. and the length of the cylinder is 5m. 

radius r =1.4/2=0.7 m., h=5m.

curved surface area of the cylinder=

area of the base of the tank=

curved area of the hemisphere=

total outer area to be painted =22+15.4+30.8=68.2 metre square

cost of painting=10*68.2=682/-