Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangle are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.
G.G-SRT.B.5
Use congruence and similarity criteria to prove relationships in geometric figures and solve problems utilizing real-world context.