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Solve angles on an isosceles triangle

This skill teaches how to solve angles in an isosceles triangle by leveraging the property that the base angles are equal and all interior angles sum to 180 degrees.

Learn solve angles on an isosceles triangle

Teaching Transcript

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What do we know about the angles on this triangle

First let's identify the type of triangle. It has two identical sides, so it's isosceles

That means that the two angles on either end of the unique side are the same

Since the inside angles must add up to 180 degrees, we can subtract and divide by 2

So our angles are both 70 degrees

Skill Practice

Solve angles on an isosceles triangle

Test your understanding of solve angles on an isosceles triangle by practicing it! Work through the below exercises to use it in practice.