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Geometry 2.5 1 You are at a party. You hear 2 of your friends talking about SUPPPLEMENTARY ANGLES. What does it mean? 1. 2. 3. 4. They are spreading rumors 2 angles add up to 180 degrees They need to get a life You are at the wrong party 2 You are at a party. You hear 2 of your friends talking about SUPPLEMENTARY ANGLES. What does it mean? 1. 2. 3. 4. They are spreading rumors 2 angles add up to 180 degrees They need to get a life You are at the wrong party 3 So A + B = 180 degrees Example 1: Angles A & B are supplementary. Angle A = 80. What is angle B? Answer: Angle B is 100. 180 – 80 (Angle A) = 100 (Angle B). 4 So A + B = 180 degrees Example 2: Angles A & B are supplementary. Angle A = 4. What is angle B? Answer: Angle B is 176. 180 – 4 (Angle A) = 176 (Angle B). 5 B 6 B 7 B 8 B 9 10 2 Supplementary Angles are next door neighbors in a high-rise apartment building. One is 50 feet. What is the other one? 50 + x = 180 x = 130 B 11 Check your work. Does 50 + 130 = 180? B 12 13