It is the largest side
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The hypotenuse will always be longer than the other sides.
In a right triangle, the longest side ... the one opposite the right angle ... is the hypotenuse. The other two sides are called "legs".
A right triangle, by definition, has a right (or 90o) angle. The side that is opposite that right angle is the hypotenuse. That is to say, the other two sides, which are not the hypotenuse, are the two sides which meet at a right angle.
No. Given a triangle with only the right angle and the hypotenuse, you cannot calculate the other sides nor the other angles.
If it has an hypotenuse then it is a right angle triangle and if you know its angles then use trigonometry to find its other two sides.