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Which describes the sides of a scalene triangle?

  1. All sides have the same length

  2. Two sides have the same length

  3. All sides have different lengths

  4. One side is right-angled

The correct answer is: All sides have different lengths

The correct answer describes a scalene triangle as having all sides with different lengths. In a scalene triangle, no two sides are equal, which differentiates it from isosceles triangles, where two sides are the same length, and equilateral triangles, where all three sides are equal. This characteristic of having unequal sides is fundamental to the definition of a scalene triangle. While the option mentioning a right angle might relate to right triangles, it doesn't pertain to the side lengths themselves and thus is not relevant to defining a scalene triangle. The other choices focus on equal lengths among the sides, which does not apply in this case.