1. 3-5 Parallel Lines and Triangles I can apply the triangle angle sum theorem to find the values of variables. I can apply the exterior angle theorem to find the values of variables.

2. Triangle Angle-Sum Theorem The sum of the three interior angles of a triangle is 180 degrees.

3. Practice 1.Find the value of x, y, and z.

4. Practice 2. Find the value of x and each angle. Classify the triangle by the angles.

5. Exterior and Remote Interior Angles

6. Triangle Exterior Angle Theorem

7. Practice

8. 4. Solve for x.