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What do you call a triangle in which no sides are the same length?

  1. Equilateral Triangle

  2. Isosceles Triangle

  3. Scalene Triangle

  4. Acute Triangle

The correct answer is: Scalene Triangle

A triangle in which no sides are the same length is referred to as a scalene triangle. In scalene triangles, not only are all three sides of different lengths, but the angles also differ. This characteristic distinguishes scalene triangles from other types, such as equilateral triangles, where all sides are equal, and isosceles triangles, which have at least two equal sides. Acute triangles, on the other hand, describe a type of triangle where all angles are less than 90 degrees, but they can be scalene, isosceles, or equilateral. Therefore, the defining property of having three unequal side lengths aligns specifically with scalene triangles, making this the correct classification in this context.