 4.1 Classifying Triangles. Example 1 Example 2.

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Presentation transcript:

 4.1 Classifying Triangles

Example 1

Example 2

Example 3

You Try It…

4.2 Angle Measures of Triangles

Triangle Sum Theorem  The sum of the measures of the angles in a triangle is 180 degrees.

Example 1

Corollary to Triangle Sum Theorem The acute angles of a right triangle are complementary.

Vocabulary

Exterior Angle Theorem The measure of an exterior angle of a triangle is equal to the sum of the measures of the two nonadjacent interior angles.

Example 2

You Try It… Find the measure of the exterior angle:

A little bit trickier now..