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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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Shapes and Angle Rules 80 + ? = 18080 + 100 = 180.

Shapes and Angle Rules 80 + ? = 18080 + 100 = 180.

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