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Use the vertical angles theorem to name a pair of congruent angles

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If we have two parallel line cut by a transversal such that the number of the angles are ordered in this manner:
1 | 2
3 | 4
5 | 6
7 | 8
The following the pair of vertical angles
∠1 and ∠4
∠2 and ∠3
∠5 and ∠6
∠7 and ∠8
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