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As the given parallel lines are intersected by the transversal.

Therefore,

 ∠a and ∠e
 ∠b and ∠f
 ∠c and ∠g
 ∠d and ∠h

Converse Corresponding Angle Axiom

If a transversal intersects two lines such that a pair of corresponding angles is equal,
then the two lines are parallel to each other.

This is called converse corresponding angle axiom.

Here 1 = 5 (Pair of corresponding angles)

∴ m // n

Theorem 6.2

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

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