ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos

Volumes of Pyramids and Cones old 1691 Views


Share It!


Description:

The formulas for the volumes of pyramids and cones are strangely similar. Actually, they're exactly the same: just multiply 1/3 by the base area by the height. Easy to remember, right? You'll be ready for the day when Egypt decides to fill up one of the Great Pyramids with water and turn it into a public swimming pool. They'll definitely want to know how to find the volume of a pyramid.

Language:
English Language

Transcript

00:04

Volumes of Pyramids and Cones, a la Shmoop. Pharaoh Tut is on his way to the hereafter,

00:11

and he may have overdone it with his list of things to bring to the underworld.

00:17

Help him calculate the volume of his pyramid so he'll know if he's going to have to leave

00:21

some stuff behind. The length and width of the base are 10 meters

00:25

and the height of Tut's pyramid is 12 meters.

00:29

The volume of a pyramid is one-third the volume of the prism with the same base.

00:36

Because we have a square base, we know that its area is length times width, which is just

00:41

100 meters squared.

00:44

We plug that into our formula and solve for the volume. One-third times 100 times the

00:50

height of 12. 100 times 12 equals 1200, divided by 3 equals 400.

00:57

His neighbor, Pharaoh Irving, is going to meet his maker in a cone rather a pyramid,

01:04

so he'll have to use the formula one-third...pi times radius squared times height to find

01:10

the volume of the cone.

01:12

If we look closely at the volume formula of a cone, it looks a lot like the volume formula

01:17

of a pyramid...

01:18

...since pi times radius squared is the area of a circle, which is the shape of a cone's

01:24

base...and B is the area of the base of a pyramid.

01:28

If the radius of the cone's base is 10 and the height is 12, we can plug them into our

01:33

formula...

01:34

1/3 times pi times 10 squared times height....equals 1/3 times pi times 100 times 12. 1200 divided

01:48

by 3 equals 400...so our answer is....400 pi.

01:54

Since 400 pi is bigger than 400...looks like Pharaoh Irving is really going to be the one

02:00

living

02:11

the good... afterlife.

Up Next

Volumen de un Cubo
750 Views

Los cubos de hielo no son ruidosos generalmente...pero tienen un volumen de tipo diferente. Este video te enseñará cómo encontrar el volumen de...

Related Videos

Volume
11021 Views

Volume is crucial to our lives. It determines the amount of food we eat, the amount of fluid we drink, and hydraulics, just to to name a few. One o...

Surface Area of Cylinders
14740 Views

Haven't you always wondered how much cardboard it takes to encase a trunk warmer for your pet elephant?

Area
8483 Views

Okay, so you know the length and width of your cutting board, but how do you find the area? Watch the video and find out. Then you can brag to all...

Daily Scribble: Volume
890 Views

Scribbling on whiteboards is fun, so fun that we decided to make math videos on whiteboards! Here's a video all about volume.