Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
3. Angles of Triangles
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Exercise 26 Page 395

We want to find the value of in the given triangle.

triangle

To do so, we will first recall a key piece of information!

Exterior Angles of a Triangle

The measure of an exterior angle of a triangle is equal to the sum of the measures of its two remote interior angles.

With this rule, we can write an equation in terms of
Now, we can solve this equation for For simplicity, we will not include the degree symbol.