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Solve opposite and supplementary angles

Solve opposite and supplementary angles when lines cross

This math skill focuses on determining opposite and supplementary angles when two lines intersect. When lines cross, the angles directly across from each other are identical, and adjacent angles along a straight line add up to 180 degrees.

Learn solve opposite and supplementary angles

Teaching Transcript

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Identify what we know about these angles

When two lines cross the angles that are opposite to each other are identical

A straight line is 180 degrees, so if we know part of that angle, the other part must be the remainder of 180

With one angle left, we can see that it has an opposite, so it's 110 degrees

Skill Practice

Solve opposite and supplementary angles when lines cross

Test your understanding of solve opposite and supplementary angles by practicing it! Work through the below exercises to use it in practice.