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Topic: Angles E2.3 – Complementary Angles

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 andBDC are complementary angles because together they make a right angle.