the two vertical and horizontal "legs" of a triangle. the other diagonal line is the hypotenuse.
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The two sides in a right triangle that form the right angle.
There is no formal definition: it is any side of a triangle. Often, if the triangle has a horizontal base, then it is one of the sloped sides. In a right angled triangle, it is one of sides adjacent to the right angle. In an isosceles triangle, it is one of the equal sides.
No. By definition, the hypotenuse leg of a right triangle must be the longest side and also must be the side opposite the right angle.
It is one of the two equivalent sides on the isosceles triangle.
If one leg of a right angled triangle is regarded as the altitude then the other leg is the base.