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Let us recall the definition of an isosceles triangle. An isosceles triangle is a triangle with two equal or congruent sides. In this definition, it is not stated that it has exactly two equal sides.

An equilateral triangle has three equal or congruent sides. If it has three equal sides, then it must have two equal sides.

Therefore, an equilateral triangle is considered as an isosceles triangle.

But, an isosceles triangle is not necessarily an equilateral triangle.

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14y ago

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