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Polygons and Perimeters: Activity 1 of 3

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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.

Polygons are defined by the number of their sides and the sum, or total, of their angles. A triangle has three sides. What is the total number of degrees in a triangle? [Hint: Use the triangle to the left for help.]

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Question 1 of 8