Question

Fill in the blank with the phrase that makes the proof statement true.

Lines A and B are parallel. Angle 1 is congruent to angle 3 by the Corresponding Angles Postulate. Angle 1 is supplementary to angle 2 because they form a linear pair. ________________ by the Substitution Property.

A. Angle 3 is congruent to angle 2
B. Angle 1 is congruent to angle 2
C. Angle 3 is supplementary to angle 2
D. Line A is parallel to line B

Answer 1

Since angles 1 and 3 are Congruent, it means they are same.......1

Now 1 and 2 are supplementary since they are a linear pair.........2

Substituting 3 for 1 in (2) implies Angles 3 and 2 are also Supplementary

C is the Answer

Explanation: