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

Answer 1

@snowflake0531

Answer 2

Assuming you don't care about the fact that Ellis doesn't need to paint the whole thing because some part of it is on the ground -.-

Answer 3

So then we do
\[surface ~area ~of~cylinder= 2(\pi r^2) + 2\pi r (h)\]

Answer 4

So use that to find the surface area of one fencepost, then multiply it by 10 to get your answer

Answer 5

what does r stand for

Answer 6

R is radius, and radius is half of diameter

Answer 7

so it would be 0.5 right

Answer 8

yes

Answer 9

would it be 172.7

Answer 10

what would the unit be

Answer 11

It would be 172.7 feet squared

Answer 12

did i get it right?

Answer 13

yes

Answer 14

It asks how much paint they would need though. How do i calculate this?

Answer 15

Yes... that's your answer...