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