CAHSEE Math 5.4 Measurement and Geometry

Measurement and Geometry Drill 5 Problem 4. Which of the following best describes the transformation as shown in the graph below?

CAHSEE MathMeasurement and Geometry
CongruenceExperiment with transformations in the plane
Coordinates and GraphsAppropriate Units and Scales
GeometryCoordinate Geometry
Experiment with transformations in the plane
LanguageEnglish Language
Measurement and GeometryCoordinate graphs

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.