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CAHSEE Math 5.4 Measurement and Geometry 342 Views
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Description:
Measurement and Geometry Drill 5 Problem 4. Which of the following best describes the transformation as shown in the graph below?
Transcript
- 00:03
Here’s an unshmoopy question you’ll find on an exam somewhere in life...
- 00:07
Which of the following best describes the transformation of triangle RST to triangle
- 00:12
R'S'T', as shown in the graph below?
- 00:16
And here are the potential answers...
- 00:23
OK, this is kind of a vocabulary test more than anything,
Full Transcript
- 00:26
and we have a few 5 dollar words we have to define.
- 00:29
Dilation is when the measurements of a shape expand.
- 00:29
Dilation is when the measurements of a shape expand.
- 00:34
Reflection is when a shape is reflected across an axis…
- 00:39
…and Rotation is when a shape is rotated on a graph.
- 00:44
Now let’s look at each of the options and see how they stack up…
- 00:47
It’s easy to see that dilation is… not the droid we’re looking for.
- 00:51
The triangle certainly does look reflected…
- 00:53
… but not across the y-axis.
- 00:55
That would look something like this…
- 00:59
But choice C supposes we reflect it across
- 01:01
the x-axis and then move it 6 units to the right…
- 01:04
…and that looks about right.
- 01:05
Just to cover all our bases, let’s take a gander at D.
- 01:08
This triangle COULD be rotated…
- 01:10
… except that if we’re rotating about the origin, R prime would be at 2,0 and not
- 01:15
4,0, as shown on the graph. So our answer is indeed C.
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