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Complementary angles

Complementary angles. When two angles add up to 90° they are called complementary angles . a. b. a + b = 90°. Angle a and angle b are complementary angles . Supplementary angles. When two angles add up to 180° they are called supplementary angles . b. a. a + b = 180°.

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Complementary angles

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  1. Complementary angles When two angles add up to 90° they are called complementary angles. a b a + b = 90° Angle a and angle b are complementary angles.

  2. Supplementary angles When two angles add up to 180° they are called supplementary angles. b a a + b = 180° Angle a and angle b are supplementary angles.

  3. Calculating angles Calculate the size of the lettered angles in each of the following triangles. 110° b 33° a y x 80° 64° 30° 31° 180 – 64 = 116 x = 116 ° 180 – 110= 70 y = 70 °

  4. Angles

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