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Plane Geometry Videos 23 videos
ACT Math: Plane Geometry Drill 1, Problem 4. What angle is supplementary to Angle 10?
ACT Math: Plane Geometry Drill 1, Problem 5. If two polygons have the same shape and size, they are what?
Geometric Planes are great and all, but you don't really want to book a flight to Tahiti on one. They're aerodynamic, sure, but good luck finding a...
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?
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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