8.2 Video Lesson: Volumes of Cones

Learning Objective: Use a formula to find the volume of a cone.

* The volume V of a cone is one-third the product of the area of the base and the height of the cone.        

Example 1: Find the volume of the cone.  Round your answer to the nearest tenth.

Example 2: Find the height of the cone.  Round your answer to the nearest tenth.

Example 3: You must answer a trivia question before the sand in the timer falls to the bottom.  The sand falls at a rate of 50 cubic millimeters per second.  How much time do you have to answer the question?

8.2 Practice Problems

Find the volume V or height h of the cone.  Round your answer to the nearest tenth.

1)                                 2)

3) The height of the sand in the timer is 12 millimeters, and the radius is 5 millimeters.  The sand still falls at a rate of 50 millimeters per second.  How much time do you have to answer the question?