### Home > CCA2 > Chapter Ch4 > Lesson 4.2.4 > Problem 4-103

4-103.

Find the measure of

Notice that

Remember geometric angle relationships.

If the lines are parallel, what must be true about the alternate interior angles?

What is always true about vertical angles?

How can you find the measure of the third angle?

Write and solve a system of equations based on the properties.

Once you find and

*, find the measures of the angles in*