Given: m 3 = m 4

Prove:

1, 2 are supplementary

STATEMENT REASON

1. m 3 = m 41.

Given

a0

2. 2, 3 are supplementary2.

a1 sides in

a2 rays

3. m 2 + m 3 = 180º3. Definition of

supplementary

a3 angles

4. m 2 + m 4 = 180º4. Substitution

5. m 1 = m 45. Opposite

a4 are

a5

6. m 2 + m 1 = 180º6.

a6

7. 1,2 are supplementary7. Definition of

a7 angles