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Question: Geometry :equilateral triangle

Question:Geometry :equilateral triangle

yangtheary 245 Maple
geometry
April 05 2021
1

Let $\triangle ABC$ be an equilateral triangle and $\angle BAC$=$20^\circ$, take point $D$ is on $AC$ such that $AD$ $=$ $BC$. Find $\angle ABD$= ?
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