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Linear Pair Theorem

If two angles form a linear pair, then they are supplementary.

Vertical angles theorem

If two angles are vertical angles, then they are congruent.

Supplementary Theorem

If two angles are supplementary to the same angle, then they are congruent

Complementary Theorem

If two angles are complementary to the same angle, then they are congruent

Right Angle Theorem

If two angles are supplementary and congruent, then they are right angles.

conditional

If p then q

Converse

if q then p

Inverse

if not p then not q

Contrapositive

If not q then not p

Biconditional

p iff q