You need a side and another angle. Hypo = side / sin angle. Eg if a side is 6 units and an angle 30 degrees then hypotenuse = 6/0.5 = 12
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Pythagoras, a greek mathematician living about 2600 years ago, became immortalised simply by finding a method for calculating the length of the hypotenuse without having to draw it out
well... one of its uses can be as follows: you see trigonometry deals with right angles right, so through the Pythagoras theorem you can find out the sides of the triangle, without which trig would be impossible!
If you know one side (s) and the opposite angle (a) then the hypotenuse = s/sin a...
side lengths
Any and every triangle has three sides and three angles; that is the defintion. The type of triangle cannot be determined without more information.