if the triangle has one right angle in it
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If it has no right angles, it is not a right triangle and therefore you cannot name a hypotenuse of that triangle. Which implies you cannot find that side's measure.
It is the longest side of a right angle triangle.
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.
By using Pythagoras' theorem for a right angle triangle.
Use the information about the right triangle that you're given, together with all of the things you've learned that are true about every right triangle.