A.1 Supplementary and Vertical Angles
Understand why vertical angles are congruent using properties of supplementary angles.
A.2 Corresponding Angles
Discover that corresponding angles are congruent.
A.3 Alternate Interior and Same Side Interior Angles
Discover the relationship between same-side interior and alternate interior angles when two parallel lines are cut by a transversal.
A.4 Missing Angles
Use angle relationships to find missing angles when two parallel lines are cut by a transversal.
A.5 Angle Sum Theorem
Explain why the sum of the measures of the interior angles of a triangle is 180 degrees.
A.6 Exterior Angle Theorem
Apply the exterior angle theorem to find missing angles of a triangle.