mynameinvalid

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I need help with this, please.

In triangle ABC, AB=AC, BC=1, and ∠BAC=36°. Let D be the point on side AC such that ∠ABD=∠CBD.
(a)Prove that triangles ABC and BCD are similar.
(b)Find AB
Explain how to do it in your answer.

mynameinvalid Dec 12, 2020