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It's also true that all three angles would be 60°, so the triangle would also be equilateral, but equilateral is a special case within isosceles. Every equilateral triangle is also isosceles.
As long as any two angles are equal, or any two sides are equal, that is enough to classify the triangle as "isosceles." If more than two sides or more than two angles are equal, the triangle stays isosceles, even if it qualifies as equilateral as well.
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