A triangle with all sides different lengths is called:

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Multiple Choice

A triangle with all sides different lengths is called:

Explanation:
When we classify triangles by side lengths, a triangle with all three sides of different lengths is called scalene. This distinguishes it from an isosceles triangle, which has two equal sides, and an equilateral triangle, which has all three sides equal. A right triangle is defined by having a 90-degree angle, which can occur with either all different sides (scalene) or with two equal sides (isosceles), but the given description specifically points to different side lengths, so scalene is the best fit.

When we classify triangles by side lengths, a triangle with all three sides of different lengths is called scalene. This distinguishes it from an isosceles triangle, which has two equal sides, and an equilateral triangle, which has all three sides equal. A right triangle is defined by having a 90-degree angle, which can occur with either all different sides (scalene) or with two equal sides (isosceles), but the given description specifically points to different side lengths, so scalene is the best fit.

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