This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the area of an equilateral triangle, assuming a side length is known. Enter the side. Then click on calculate. In a triangle, all interior angles total to 180 degrees. No two angles can total to 180 degrees or more; in an equilateral triangle, all angles are equal, or 180 degrees/3. The formula for the area is the square root (3)/4 * (s * s). It is for equilateral triangles. In case you need them, here are the Trig Triangle Formula Tables, as well as the Right Triangle Angle And Side Calculator.
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