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Don't know much about geometry? If you can spot a triangle-shaped street sign, a rectangle-shaped dollar bill, or an L-shaped floor plan you may know more than you think.

All of these shapes are **polygons. **Polygons are closed geometric figures with straight sides.

When two lines connect, they form an ANGLE. Angles are measured in units called **degrees**. Here's a familiar 3-sided polygon: a triangle.