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hypotenuse = sqr ( 5² + 12² ) = 13.
It is 13 units in length
With sides of 5 and 12, you can make a triangle with any perimeter you want between 24 and 34. If you call them "legs" because they are the sides of a right triangle, then the hypotenuse is 13, and the perimeter is 30.
If the legs are 3 and 4 then hypothenuse is 5 (SQRT (3 squared + 4 squared)) = 5) So perimeter is 3 + 4 + 5 = 12
5 x 5 = 25 12 x 12 = 144 25 + 144 = 169 13 x 13 = 169 The hypotenuse is 13.