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Sec 1-4 Concepts: Classifying Angles Objectives: Given an angle, name, measure and classify it as measured by a s.g.

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Example 1: Name the ~~
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Classify the angle with the given measure as acute, obtuse, right or straight. m

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Use a protractor to measure the angle. Then classify it. 1. 2. 101 131

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Example 3: Find the indicated angle measure 120 60 a bc e d f g 15

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Example 4: For each city on the polar map, estimate the measure of

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Angle Addition Postulate If P is in the interior of

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Example 6: Use the angle addition postulate to solve for x. Then find the measure of each angle. O P R Q (X+4) + (2x-2) = 26 3x+2=26 3x=24 X=8 m

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Example 6 cont.: Use the angle addition postulate to solve for x. Then find the measure of each angle. O P R Q (3X+7) + (5x-2) = 61 8x+5=56 8x=56 X=7 m

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Example 7: JK bisects < HJL. Given that m

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Example 8: BD bisects

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Classifying Triangles Lesson 15.3. Classifying by Angle Acute triangles have three acute angles. Obtuse triangles have one obtuse angle. Right triangles.

Classifying Triangles Lesson 15.3. Classifying by Angle Acute triangles have three acute angles. Obtuse triangles have one obtuse angle. Right triangles.

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