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aln+cml=180 co int angle
aln=dml alt int angles
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1. There sum will be 180° because as the property of parallel lines sum of corresponding angles are 180°.
2. Both will be equal by Vertically Opposite Angeles.
3. Since AB is parallel to EF but in first question it is given that sum of those angles are 180° so they will parallel to each other.
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