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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.