Question

The diagram shows the dimensions of a teepee. Find the volume of the building to the nearest cubic unit. Use 3.14 for pi.
A. 1,780 ft3
b. 1,382 ft3
C. 21,363 ft3
D. 5,341 ft3

Answer 1

Find the area of the base.

Answer 2

how? that how lost i am =/

Answer 3

It's just a circle.

Diameter is 20 ft. Radius is 10 ft. Area = \(\pi (10\;ft)^{2} = 100\pi\;ft^{2}\)

Make sense?

Answer 4

will i know pi is 3.14

Answer 5

That is of no consequence. It's better just to keep it \(\pi\) until we need an approximation.

Okay, if this were a right circular cylinder, we would just multiply by the height, 17 ft. since it is a cone (teepee), we get only 1/3 of that.

Thus, \(100\pi\;ft^{2}\cdot 17\;ft\cdot\dfrac{1}{3}\), which is now ready for numerical approximation. What do you get?

Really, you just have to know the formula for a Right Circular Cone, \(\dfrac{1}{3}\pi r^{2}h.\)

Answer 6

@Shadowking625

Answer 7

@FallenLeo... @tkhunny has provided great information on how to solve this problem there is no need to tag other people when you have one helping you....