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Plane Geometry Videos 26 videos
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ACT Math 4.5 Plane Geometry 253 Views
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ACT Math: Plane Geometry Drill 4, Problem 5. What is the height of the prism?
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
Full Transcript
- 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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