1. Geometric Proofs
Standards 2i & 2j

2. Given:
and
are supplementary
Prove:
and
are supplementary
and
are supplementary
Given
and
are supplementary
Definition of Supplementary Angles
Transitive Property

3. Transitive Property If
and
then
The b’s are what make it transitive

4. Given:
and
are supplementary
Prove:
and
are supplementary
and
are supplementary
Given
and
are supplementary
Definition of Supplementary Angles
Transitive Property
Reflexive Property of Eq.
Addition/Subtraction Property
Definition of Congruent Angles

5. Given:
and
are right angles
Prove:
and
are right angles
Given
Definition of Right Angles
Transitive (or Substitution)
Definition of Congruent Angles