Generally speaking, in math, legs are two sides of right triangles or isosceles triangles.
In a right triangle, the legs are the two sides of the triangle that are not the hypotenuse. For example, in a 5-12-13 triangle, the sides measuring 5 and 12 are both legs of the triangle.
In a non-equilateral isosceles triangle, the legs are the two congruent sides.
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