It isn't. An equilateral triangle has 3 equal sides whilst a isosceles only has 2. ;)
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Not ... exactly. It would be closer to accurate to say that an equilateral triangle is a special case of the isosceles triangle.All equilateral triangles are (also) isosceles; but most isosceles triangles are not equilateral.
No.
It can be scalene or isosceles but not equilateral.
Yes. But not all isosceles triangles are equilateral.
Are isosceles triangle sometimes an equilateral triangle