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Is an equilateral triangle is sometimes, never or always an isosceles triangle?

Answer 1

It is always an isosceles triangle.

The definition of an isosceles triangle is that it was 2 congruent sides. The definition of an equilateral triangle is that all sides are congruent. That means that at least 2 sides of the equilateral triangle are congruent, therefore we can conclude that it is isosceles, as long as equilateral.

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Answer 2

Caroline Aucoin

An equilateral triangle is always an isosceles triangle.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.