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The perimeter of any triangle is the sum of its 3 sides.
Find the perimeter of a right triangle with legs measuring 3 and 4
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.
There is not enough information to answer the question.
Add up the sides.