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Theorem 6.2 : If a transversal intersect...

Theorem 6.2 : If a transversal intersects two parallel lines, then each pair of alternate interior angles is equal.

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Since ray `ND` stands on line `EF`,
`/_3 + /_5=180 ` (linear pair of angles)
But, `/_ 1 = /_5` (Corresponding angles as `AB∣∣CD`)
From above equations, we get `/_ 1+ /_ 3=180`
Again ray `CN` stands on `EF`,
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