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Jackdbernier · Answer 1 · 2018-03-21T20:38:44+0000

AC is a common side, ∠ACD = ∠ACB and CD = BC ⇒ ΔACD and ΔABC are congruent (SAS definition).

Congruent triangles have exactly the same three angles, so ∠D = ∠B.

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