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Topic: Angles E2.3 – Opposite Angles

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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.


Two intersecting lines create a pair of opposite angles. Opposite angles are equal.

In the figure below, two straight lines intersect to create a matching pair of opposite angles.

a and b are opposite angles, so they have the same measurement.