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ACT Math 4.5 Plane Geometry 253 Views


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Description:

ACT Math: Plane Geometry Drill 4, Problem 5. What is the height of the prism?

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Transcript

00:02

Here's your shmoop du jour, brought to you by Prisms. Where shapes go when they break the law.

00:12

A rectangular prisms length is twice its width, and its height is three times its width.

00:18

If the volume of the prism is 3,072, what is the height?

00:23

And here are your potential answers...

00:28

We are first told that were dealing with a rectangular prism, so certain images should

00:32

immediately come to mind.

00:34

With any of these things, the total volume

00:37

is measured by the length times width times height. Using the values from this problem,

00:42

we are given: width, which we can label as x

00:46

length, which equals 2 times width or 2x and height, which equals 3 times width or 3x.

00:54

If we multiply them all together, we get 6x

00:57

cubed, which is the volume and which we are told equals 3,072.

01:03

We first divide 3,072 by 6, we get 512. Then what times what times what is 512

01:11

8 times 8 = 64 times 8 is 512. X=8

01:15

Well they ask for the height.

01:17

All we have to do is multiply x, the width, by 3 the height to get 24, which means

01:23

B is the correct answer.

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