An equilateral triangle has 3 sides that are equal in length and 3 interior angles that each measure 60 degrees
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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.
The answer depends on what other information you have about the triangle.
There are several different formulae for the area of a triangle - depending on the available information - and these were invented by different people.
If you know the lengths of the sides, you can use the cosine rule. If you have information about other aspects of the triangle, then other formulae will apply.
The sum of all angles in any triangle equals 180 degrees.
There are different formulae, depending on what you DO know. Here you will find several: http://en.wikipedia.org/wiki/Triangle#Computing_the_area_of_a_triangle