Question

Hfbna closed cylindrical tank has a diameter 4.2 m and height 14 cm what is the capacity of the tank how much will it cost to the paint or service and the top of the tank at the rate of 4 rupees m square

Answer 1

first we will find the total surface area of cylinder

which is 2¶ r(r+h)

diameter is 4.2 and

the radius 2.1

total surface area of cylinder is 2*22/7*2.1(2.1+14)

2*22/7*2.1(16.1 )

2*22/7*2.1*16.1

=212.52 m^2

cost of painting 1 m is 4

cost of painting 212.52 *4

= 850.08

hope this answer help you

please mark me at brainliest