Leg
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]](http://latex.artofproblemsolving.com/6/6/0/660dcc149a64cfad6e4739c5b9d0f9a9fc74d42b.png)
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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