**Warmup**

**Activity #1**

**Observe the Effect of Scaling on an Image.**

Here is a portrait of a student. In this activity, you are going to interact with the portrait to discover scaling.

- Move the slider under each image, A–E, and observe the change.

** Activity #2**

**To Match Scaled Copies of Polygons.**

In the applet below is a set of cards that have polygons drawn on a grid.

- Display the cards face up by clicking on them, then match a pair of polygons that are scaled copies of one another.

- Select one pair of polygons and use the segment tool on the grid below to produce both polygons.

(1.) Explain or show how you know that one polygon is a scaled copy of the other.

(2.) Is it possible to draw a polygon that is a scaled copy of both Polygon A and Polygon B? Either draw such a polygon, or explain how you know this is impossible.

** Activity #3**

**To Create Scaled Copies**.

- Draw two scaled copies of the figure on the grid below using a scale factor of 2 and 1/2.

- Draw two scaled copies for Figure B on the grid below using a scale factor of 3 and 1.5

- Look at the triangles in the graph below and answer the question that follows.

**Summary**

**Challenge #1**

Tyler says that Figure B is a scaled copy of Figure A because all of the peaks are half as tall.

Do you agree with Tyler? Explain your reasoning.

**Challenge #2**

Here below is a figure that looks like the letter A, along with several other figures. Which figures are scaled copies of the original A?

(2.) Explain how you know.

**Challenge #3**

Here is a picture of the Rose Bowl Stadium in Pasadena, CA.

**Quiz Time**

The quiz below can be completed at www.ixl.com. After a trial practice, click on our subscription link in the video, to see how much you’ll save when you signup from our website.

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