12. Complete the two-column proof. Given: m 22 m23
Prove: m21-m24
Statements
Reasons
1. m 2 = m23
1.
Given
2.
2. m2 1 + m22 = 180°
m23 + 24 = 180°
3. m2 1 + m2 = m23 + m24
3.
4. m21 = 24
4.

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