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.
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If the legs are 3 and 4 then hypothenuse is 5 (SQRT (3 squared + 4 squared)) = 5) So perimeter is 3 + 4 + 5 = 12
A triangle has side lengths of 3, 4, and 5. The perimeter is 12 total. Perimeter is the total length of the outside of the object.
It is 13 units in length
hypotenuse = sqr ( 5² + 12² ) = 13.
5, 5 and 2 units