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 the equilateral triangle is 3 times 4 = 12 cm