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What you will learn:
- To find the measures of angles of triangles
- To use exterior angles of triangles
- To classify polygons
- To find the sums of the measures of the interior and exterior angles of polygons
Investigation: The Sum of Three angle measures
Investigation: The Sum of Three angle measures
- Draw and cut out a large triangle.
- Number each angle and then tear them off.
- Place the three angles adjacent to each other to form one angle.
- Compare your results with others. Write your observations.
- Make a conjecture about the sum of the measures of the angles of a triangle.
The Polygon Angle-Sum Theorems
The Polygon Angle-Sum Theorems
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