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Lines c and d are parallel lines cut by transversal p.

Horizontal and parallel lines c and d are cut by transversal p. On line c where it intersects with line p, 4 angles are formed. Clockwise, from uppercase left, the angles are: 1, 2, 3, 4. On line d where it intersects with line p, 4 angles are formed. Clockwise, from uppercase left, the angles are: 5, 6, 7, 8.

Which must be true by the corresponding angles theorem?

∠1 ≅ ∠7

∠2 ≅ ∠6

∠3 ≅ ∠5

∠5 ≅ ∠7