Leg

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Generally speaking, in math, legs are two sides of right triangles or isosceles triangles.

Right Triangle

[asy] dot((0,0)); dot((4,0)); dot((0,3)); draw((0,0)--(4,0)--(0,3)--cycle); draw(rightanglemark((4,0),(0,0),(0,3))); [/asy] 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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