Proof that Equilateral Triangles are Equiangular

In the previous post, we have proved the Isosceles Triangle Theorem. The theorem states that the angles opposite to the two congruent sides of an isosceles triangle are congruent.  In this post, we use the said theorem to prove that equilateral triangles are equiangular.   Theorem Equilateral triangles are equilangular.
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