An Angle from Equal Segments

★ 7/10plane geometry Trigonometric Identities Triangle Geometry

Problem

In $\triangle ABC$ , $AB = AC$ . Extend $AB$ to $D$ and extend $CA$ to $E$ , and connect $DE$ , so that $AD = BC = CE = DE$ . Find $\angle BAC$ .

Answer

Solution

Difficulty	7/10
Topics	plane geometry, Trigonometric Identities, Triangle Geometry

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