In order to know what side of XYZ is the longest one needs more information. You need to know some of the measurements in order to solve this.
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You divide the length of the shortest side by the length of the longest side.
The longest side of a right angle triangle is called the hypotenuse.
It all depends on what xyz is. If xyz is an arc of a curve, there will be no vertex whereas if xyz is a triangle, each of x, y and z will be a vertex.
It is the hypotenus.
It is called the hypotenuse. The adjacent side is beneath it and the opposite side opposite it.