The distance around. Add up the three sides.
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The perimeter of the equilateral triangle is 3 times 4 = 12 cm
There is no circumference of a triangle. If the perimeter of a triangle is what you are wondering about, it is different for each triangle. Just add the three sides together.
-- Measure or calculate the length of each of its 3 sides. -- Add the lengths of its 3 sides. -- The sum is the perimeter of the triangle.
That depends on the size of the angles which, in turn, determines the geometry of the triangle.
You can't tell. There are an infinite number of triangles that all have a perimeter of 144.