Perpendicular
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They're called the "legs" of the triangle. The side that doesn't touch the right angle is called the "hypotenuse".
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 rays that form an angle are called the legs or sides of the angle. The meeting point of the two rays that form an angle is called the vertex.
The two sides in a right triangle that form the right angle.