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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.

**Complementary angles are two angles that add up to 90°.**

Here are examples of complementary angles.

These two angles are complementary angles because **45° + 45° = 90°**.

∠ADB and ∠BDC are complementary angles because together they make a **right angle**.