Complementary & Supplementary Angles. Complementary Angles Two angles are called complementary angles if the sum of their degree measurements equals 90.

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Presentation transcript:

Complementary & Supplementary Angles

Complementary Angles Two angles are called complementary angles if the sum of their degree measurements equals 90 degrees. Example: These two angles are complementary.

These two angles can be "pasted" together to form a right angle!

Supplementary Angles Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. Example: These two angles are supplementary.

These two angles can be "pasted" together to form a straight line!

Adjacent Angles Adjacent angles have a shared vertex and arm. Ex. Angles A & B are adjacent

Linear Pairs A pair of adjacent angles that forms when 2 lines intersect Ex. Angle ADC & Angle BDC are a linear pair Linear pair rule: If 2 angles form a linear pair, then they are supplementary

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Complementary and Supplementary 1. Two angles are complementary. One measures 65 degrees. 2. Two angles are supplementary. One measures 140 degrees. Find the missing angle. Answer : 25 Answer : 40

Complementary and Supplementary Find the missing angle. You do not have a protractor. Use the clues in the pictures x x X=35 X=15