45 45 90 triangles' legs are always the same, because it is isosceles. The hypotenuse is just x (the leg's value) multiplied by the Square root of 2
30, 60, 90 triangles are not isosceles, but is a special right triangle because the side lengths are easily found if you have one of them. For example x, multiplied by two, is the hypotenuse, and x multiplied by the square root of x, is the long side.
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