Ellis is painting wooden fenceposts before putting them in his yard. They are each 7 feet tall and have a diameter of 1 foot. There are 11 fenceposts in all. How much paint will Ellis need to paint all the surfaces of the 11 fenceposts? Use 3.14 for π, and round your answer to the nearest hundredth.

Question

hunter3506 · Answer

• Hope these fences are cylindrical

r is radius

h is height, h = 6 feet

• Amount of paint

• But amount must be in liters

1 cubic foot = 28.32 litres

Amount = 56.52 × 28.32

Amount = 1600 litres

hunter3506 · Answer

how did u get that?

hunter3506 · Answer

yea i just redid it and you r right srry bout that

Vocaloid · Answer

Why are you two talking about volume? He’s only painting the surfaces of the poles so your answer should be in square feet not cubic feet. Calculate the surface area of a cylinder with height 7 feet and diameter 1 foot, then multiply by 11 for 11 posts.

surjithayer · Answer

you are correct .
$$surface~area~of~11~poles=11\times 2\pi rh+2\pi  r^2$$$$=11\times 2\times3.14\times \frac{ 1 }{2 }\times 7+2\times 3.14 ( \frac{ 1 }{ 2 })^2$$
$$=77\times 3.14+1.57=1.57(154+1)=1.57\times155=243.35 ~\square~feet$$