Mathematics

Statement                                    Reason
$$\angle 1 + \angle 8 = 180^o$$   .......................


SOLUTION
Reason $$:$$
$$\angle 1=\angle 5$$   (Corresponding angles as $$l||m$$)
$$\angle 5+ \angle 8={ 180 }^{ \circ  }$$   (Supplementary angles made on a line at a point)
Put $$\angle 5 = \angle 1$$
$$\angle 1+\angle 8 ={ 180 }^{ \circ  }$$
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