Answer:
Reasons 1. Given
2. Angle Addition Postulate
Statements
+
1. AD|| BC
2. mZ3+m25 mZDAB
3. m24+mZDAB = 180*
4. m24+mZ3+ m25 180°
5. 21 $ 24, 22 & 25
6. mZ1 m24, m22 m25
7. mZ1+m/2+mZ3 180°
3. Linear Pair Postulate
4. Substitution Property of Equality
15.
2
6. Definition of Congruent Angles
7
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