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Grade 8 · G

Angles Formed by Parallel Lines and a Transversal

When a transversal crosses parallel lines, corresponding angles are equal, alternate interior/exterior angles are equal, and co-interior angles sum to 180°.

Grade 8Common Core 8.G.A.5GVerified correct ✓

Worked examples

Two parallel lines are cut by a transversal. One of the corresponding angles measures 80°. What is the measure of the other corresponding angle?
Answer: 80
Two parallel lines are cut by a transversal. Two co-interior (same-side interior) angles are formed. One measures 130°. What is the measure of the other co-interior angle?
Answer: 50

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Angle Relationships — Complementary, Supplementary, VerticalTriangle Side and Angle Inequalities

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