The perimeter is a characteristic of a 2-dimensional object. A 12 by 13 by 5 sounds like a 3-dimensional object which would not have a perimeter.
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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.
perimeter = (5+5+12+12)= 34 area = (5*12) = 60 squared
Perimeter = distance around all 4 sides = 12 + 5 + 12 + 5 = 34 inches.
5 + 1 + 5 + 1 = 12 units.
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.