**Warmup**

**Activity #1**

Which Regular Plane Figures Tile a Plane?

A regular plane figure is a plane figure whose sides and interior angles are all the same. A square is a regular plane figure for example. So, in the following activity, you are going to figure out which regular plane figures tile a plane. The instructions are here below.

- Move the “vertices” slider in the applet below to start at 3.
- Use the red circle to rotate the figure to form a tessellation. Any direction you choose is ok.
- Repeat the steps with different number of sides up to 15. (
**Note:***For tiling to occur, there must be no gaps or overlaps.*)

**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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