Student's Work Adv. Triangle ABC will always be an isosceles, because AB and AC are congruent because all radii of the circle are congruent. The base angles are always congruent. The vertex angles isn't congruent to any of them. You can't make a triangle that is an equilateral triangle that isn't equiangular and you can't make a equiangular triangle that isn't equilateral.
All equiangular triangles are congruent to all equilateral triangles.
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