Question

what is meant by legs of the triangle :::::;???

Answer 1

tA leg of a triangle is one of its sides. For a right triangle, the term "leg" generally refers to a side other than the one opposite the right angle (which is termed the hypotenuse). Legs are also known as catheti.
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Answer 2

the side which represents the common or neighbouring border to the right angle in a triangle is called legs.