They're called the "legs" of the triangle.
The side that doesn't touch the right angle is called the "hypotenuse".
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The right angle is formed by the intersection of the triangle's "legs".
If its in the form of an isosceles right angle triangle then it will have 2 equal sides.
The two sides in a right triangle that form the right angle.
They are the two shorter sides which meet to form the right angle.
The two shorter sides are the legs.