### Home > CCG > Chapter 6 > Lesson 6.2.5 > Problem 6-97

6-97.

For each shape below, use the geometric relationships to solve for the given variable(s). Show all work. Name the geometric relationships you used. Homework Help ✎

What is the sum of the angles within a triangle?

, Triangle Angle Sum

What do the tick marks on the sides of the triangles mean?

, Isosceles triangle

Extend the parallel sides.

Parallel lines have same side interior supplementary angles.

By the Equal Values Method:

Parallel lines

Use the Law of Cosines to solve for the unknown side.