In a right angled triangle, there are three sides. The longest of these is referred to as the hypotenuse. This longest side is always the side opposite the right angle. The other two sides are most often referred to as the "opposite" and "adjacent" depending on which other angle you are looking at. If you look at an angle other than the right angle, it will touch two lines. One of these is the hypotenuse, the other is the adjacent. The line it is not touching is the opposite.
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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.
They're called the "legs" of the triangle. The side that doesn't touch the right angle is called the "hypotenuse".
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.