One link in a chain was made from a cylinder that has a radius of 3 cm and a height of 25 cm. How much plastic coating would be needed to coat the surface of the chain link? Use 3.14 for π.

Given:

Radius of cylinder = 3 cm

Height of cylinder = 25 cm

To find:

The plastic coating that would be needed to coat the surface of the chain link.

Solution:

We need to find the curved surface area of the cylinder to find the plastic coating that would be needed to coat the surface of the chain link.

Curved surface area of a cylinder is

where, r is radius and h is height of the cylinder.

Putting π=3.14, r=3 and h=25 in the above formula, we get

Therefore, the plastic coating that would be needed to coat the surface of the chain link is 471 cm².