Question

An open cylindrical oil tank has diameter 14cm and height 9m.if the inner side of the tank has to be painted all over ,what will it cost at,40 per sq metre

Answer 1

hey mate,

here is ur answer,

so given ,

diameter=14cm

radius=7cm

height=9m=900cm

To find the surface area of a cylinder add the surface area of each end plus the surface area of the side. Each end is a circle so the surface area of each end is π * r², where r is the radius of the end. There are two ends so their combinded surface area is 2 π * r²

so, surface area=2πr²=2(3.14)(7²)=98(3.14)=307.72cm²=3.07m²

so the total cost to paint=3.07(40)=122.8$

Answer 2

Step-by-step explanation:

diameter =14

*radius=7

height=900

CSA =2πrh

=2*22/7*7*900

=44*900

=39600 sq cm

cost =area *rate

= 39600*40

= 1584000rs

= 1584rs