We see that ∠1 and ∠2 are Vertically Opposite Angles
Thus, ∠1 and ∠2 are equal.
So, m∠2=60°
We see that ∠2 and ∠3 are Corresponding Angles.
And since the lines m and n are parallel, ∠2 and ∠3 are equal.
So, m∠3=60°
Therefore, ∠1 and ∠3 are equal angles.
