The length of each side is 9.2376 cm. (rounded)
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Given an altitude of 12 units, an equilateral triangle has side lengths of 13.9 (13.85641) units.
Each side of the triangle is 16.16581 units in length.
An equilateral triangle has 3 equal interior angles each of 60 degrees. There are two right angled triangles in an equilateral triangle. So we can use trigonometry to find the length of one side of the equilateral triangle then multiply this by 3 to find its perimeter. Hypotenuse (which is one side of the equilateral) = 15/sin 60 degrees = 17.32050808 17.32050808 x 3 = 51.96152423 Perimeter = 51.96152423 units.
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Height = sqrt(3)/2 * length of side So here, approx 4.3301 cm