To find the perimeter, find 2 times the length and add 2 times the width.
2(3) + 2(4) = ?
6 + 8 = 14 inches
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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.
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.
I am not sure that there is an agreed definition of a perimeter of a 3-dimensional object.
The area is the inside of the shape. so the certain amount of space in the object Perimeter is the distance on the out side of a object i.e. if a square has sides 3 inches long. the area would be 9inches (3*3) the Perimeter would be 12 (3+3+3+3)
If the legs are 3 and 4 then hypothenuse is 5 (SQRT (3 squared + 4 squared)) = 5) So perimeter is 3 + 4 + 5 = 12