Prove: Ill m

3

1

2

STATEMENT

REASON

1.21 and 22 are supplementary angles 1. Given

2 m2 1 + m2 = 180°

2.

3 21 and 23 are supplementary angles 3. Exterior sides in opposite rays

4

4

5. m_1 + m2 2 = m_1 + m23

5

6

6

7. All m

7

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