If M is the midpoint of AB, then AM + MB = AB
If two angles form a linear pair, then they are supplementary angles
if the noncommon sides of two adjacent angles form a right angle, then the angles are complementary angles
Congruent Supplements Theorem
if two angles are supplementary to the same angle (or to congruent angles) then they are congruent
Congruent Complements Theorem
if two angles are complementary to the same angle (or to congruent angles) then the two angles are congruent
Vertical Angles Theorem
If two angles are vertical, then they are congruent
Right Angle Theorem
All right angles are congruent
Right Angle Theorem (Perpendiculars)
Perpendicular lines intersect to create four right angles.
Right Angle Theorem (Supplements)
If two angles are congruent and supplementary, then each angle is a right angle.
Right Angle Theorem (Lin. Pairs)
If two angles form a linear pair and are congruent, then they are right angles.
Right Angle Theorem (Perp. Lines)
Perpendicular lines form congruent adjacent angles.