There are at least 2 possible answers:
(1) 3 times the length of one side
(2) If for some reason you don't have the side length but just have the height then you can use the formula:
square root(H^2/.75)
Where H is the height of the triangle
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Perimeter of equilateral triangle: 24 units Area of equilateral triangle: 27.713 square units rounded to three decimal places
The formula for the perimeter of an equilateral triangle is P = 3s, where P is the perimeter and s is the length of one side. The formula for the area of an equilateral triangle is A = (s^2 * sqrt(3)) / 4, where A is the area and s is the length of one side.
Perimeter is the sum of the sides. An equilateral triangle has three sides of equal length. So the perimeter in this case would be 7.8mm x 3 = 23.4mm.
12.9
An equilateral triangle that has a perimeter of 57 feet has three equal sides of 19 feet.