Mathematics

Statement                            Reason
$$l || m$$                       .......................


SOLUTION
$$\angle 5+\angle 8={180}^{\circ}$$ (Straight angles made on line $$AB$$ at $$C$$)
$$\angle1=\angle5$$ (Corresponding angles)
Put $$\angle 5=\angle1$$
$$\Rightarrow \angle1+\angle8={180}^{\circ}$$
Hence proved that $$\angle 1$$ is supplement to $$\angle8$$
  
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