Question

Ellis is painting wooden fenceposts before putting them in his yard. They are each 5 feet tall and have a diameter of 1 foot. There are 10 fenceposts in all. How much paint will Ellis need to paint all the surfaces of the 10 fenceposts? Use 3.14 for π, and round your answer to the nearest hundredth. Provide an explanation and proof for your answer to receive full credit.

* I know the answer I just need help the how much paint part.

Answer 1

@justus

Answer 2

@Vocaloid

Answer 3

@umm

Answer 4

the fenceposts are shaped like cylinders, I presume. it states that all the surfaces of all the cylinders must be painted, so I presume you just need to calculate the surface area of 10 cylinders with the given dimensions

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

plug in the radius, height, and find SA, then multiply by 10 fenceposts.

Answer 5

I found 172.7

Answer 6

but how do I know how much paint, like just answer "you will need 172.7 paint?"

Answer 7

the units are feet, so the units of SA are square feet

I haven't checked the calculation yet, but assuming your answer is correct, 172.2 square feet of paint

Answer 8

*172.7

Answer 9

Okay, thank you! i was confused lol