Gravel to the nearest cubic feet IM SOOO LOST?

Question

A pile of gravel is the shape of a cone. The pile is 40 feet in diameter and 45 feet high. Calculate the amount of gravel to the nearest cubic feet.

Answer 1

this is a volume problem.  the formula for volume of a cone is (1/3)*pi*r^2*h

So (1/3) times pi times radius squared times height

The height is 45 feet, and the radius is half the diameter -- 40/2 = 20

Then just plug the parts in!

Answer 2

The formula for the volume of a cone is:

(1/3) π r^2 h=V

So the radius is 20 and the height is 45

so plug it in

(1/3)π(20^2)(45)=V

(1/3)π(400)(45)=V

(18000π)/3=V

6000π=V

Answer 3

(1/3) area of the base tims the height

(1/3) pi r^2 h = (1/3) pi 20^2 * 45 = 1885