Co-Interior Angles
These lessons, with videos, examples, solutions and worksheets help Grade 8 students learn about co-interior angles (also called consecutive interior angles, same side interior angles).
Related Pages
Alternate Interior Angles
Corresponding Angles
More Lessons for Grade 8
Math Worksheets
What is the Consecutive Interior Angles Theorem?
The Consecutive Interior Angles Theorem states that if two parallel lines are cut by a transversal,
then consecutive interior angles are supplementary (= 180°).
What is the Alternate Interior Angles Theorem?
The Consecutive Interior Angles Theorem states that if two parallel lines are cut by a transversal,
then each pair of alternate interior angles is congruent.
The following figures give the some examples of co-interior angles. Scroll down the page for more examples and solutions.
How to use the Consecutive Interior Angles Theorem?
Parallel lines : Alternate Interior, Corresponding and Co-interior angles
Parallel Lines and Interior Angles
Relationships between Parallel Lines and Interior Angles
Parallel Lines and Transversal
Helps describe the angle pairs formed by parallel lines and a transversal. Looks at corresponding,
alternate interior and same side interior angles
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