Question

Use 3.14 as pi. Lionel wants to paint a cylindrical hollow plastic pipe with a radius of 4 metres and a length of 20 metres. a. Determine the surface area to be painted.

Answer 1

The formula for the surface area of a cylinder is:

2(pi)(r)(h) + 2(pi)(r^2)

Where:
pi = 3.14
r = radius = 4 metres
h = length = 20 metres

Substituting the values, we get:

2(3.14)(4)(20) + 2(3.14)(4^2)
251.2 + 100.48
351.68

Therefore, Lionel needs to paint a surface area of approximately 351.68 square metres.