## 4.2 Angle Relationships with Triangles

_Triangle Sum Theorem 4-2-1: the sum of the angle measures of a triangle is = to 180 deg.

3rd Angles Theorem 4-2-5: if 2 angles of one triangle are congruent to 2 angles of another triangle, then the 3rd pairs of angles are congruent

3rd Angles Theorem 4-2-5: if 2 angles of one triangle are congruent to 2 angles of another triangle, then the 3rd pairs of angles are congruent