The formula for the surface area of a cylinder is:
2πrh + 2πr^2
where r is the radius, h is the length, and π is pi (approximately 3.14).
Substituting in the given values, we get:
2π(4)(20) + 2π(4^2) = 502.4 + 100.48 = 602.88
So the given surface area is correct.
To find the volume of paint needed, we need to divide the surface area by the amount of surface area that can be covered by 1 litre of paint:
602.88 ÷ 12 = 50.24 litres
Therefore, Lionel will need 50.24 litres of paint to cover the cylindrical hollow plastic pipe.
Lionel wants to paint a cylindrical hollow plastic pipe with a radius of 4 metres and a length of 20 metres. The surface area is 602.88. Given that 1 litre of paint will cover 12 square metres, determine the volume of
paint needed to be painted.
1 answer
1 answer