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.

Answer 1

You first need to fine the surface area of one fencepost. Then multiply 10 of that answer.

Answer 2

@thisthatyuh

Answer 3

Thats all? @silvernight269

Answer 4

how do I find surface area

Answer 5

The surface area of a cylinder

Answer 6

2πrh+2πr^2

Answer 7

h is 5 and r is 1/2?

Answer 8

yep

Answer 9

2*pi*1/2*5 + 2*pi*1/2^2 = 17.2787595947

Answer 10

now what I do

Answer 11

multiply by 10?

Answer 12

why was the surface area a cylinder

Answer 13

Jw, is there anything else associated with this problem? Like diagrams or other supporting images? If so, upload them.

Answer 14

Sorry no :(

Answer 15

But as @silvernight269 mentioned, if it is a cylindrical fence post, then do what she did. But we have no way of knowing because you didn't provide us what type of post it is

Answer 16

The reason why is could be cylindrical is because...

Where the line in the middle of the circle is the diameter

Answer 17

okie so I just find the surface area, then multiply that by 10?

Answer 18

Thus, you have 2 different answers.
Answer one: Surface area of the cylinder where your diameter is 1 (radius is half) and height is 5
Answer 2: surface area of a rectangular prism where side length is 1, and height is 5.

Answer 19

And the multiply by ten for both

Answer 20

^ is your explanation

Answer 21

Nah, there should only be one answer and it will be a cylinder post otherwise there would be no reason for it to use the word diameter and also tell you to use 3.14 for pi

Answer 22

Silverknight is correct

Answer 23

Oh yeah, that is true. Just the first answer, Ignore the rectangular one

Answer 24

ok