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#### Ontario Curriculum Expectation:

#### 6.E2.3 use the properties of supplementary angles, complementary angles, opposite angles, and interior and exterior angles to solve for unknown angle measures.

**Supplementary angles are two angles that add up to 180°.**

Here are examples of supplementary angles.

These two angles are supplementary angles because **135° + 45° = 180°**.

Angles on a straight line always add up to 180º. *∠a* + ∠*b* = 180°