The perimeter of a triangle is the sum of its 3 sides
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Perimeter of a triangle = (length of side #1) + (length of side #2) + (length of side #3)
That depends on what type of triangle is if the side given is equal to the perimeter divided by 3 then it is an equilateral triangle.
It depends on what is known about the triangle.
12.9
The perimeter of an equilateral triangle with a side length of 4 inches is 12 inches. Each side of an equilateral triangle is equal in length, so the perimeter is found by multiplying the side length (4 inches) by 3.