The term scalene is used to mean that the sides are all unequal, which is to say, all different.
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A scalene triangle has no congruent sides. An equilateral has all equal sides, and an isosceles triangle has two of three sides equal.
3 equal sides = equilateral 2 equal sides = isosceles all sides different = scalene
equilateral have all equal sides.scalene have no equal sides.
They all have 3 sides but an equilateral triangle has 3 equal sides, an isosceles triangle has 2 equal sides and a scalene triangle has no equal sides.
A question without any equal sides is a scalene triangle. A scalene triangle, by definition, is a triangle without any congruent sides. Of course, there are varying definitions, but they all have the same gist. Once again, a triangle without any equal sides is a scalene triangle!