$\"\"$

Given: $\"\"$ are supplementary

$\"\"$ are supplementary

$\"\"$

Prove: $\"\"$ $\"\"$

Proof:

$\"\"$ Statements Reasons

a. $\"\"$ are supplementary a. Given

$\"\"$ are supplementary

$\"\"$

b. $\"\"$ $\"\"$ b. Definition supplementary angles

c. $\"\"$ c. Substitution Property

d. $\"\"$ d. Definition congruent angles

e. $\"\"$ e. Subtraction Property

f. $\"\"$ f. Definition of congruent angles.