Your probably thinking, what does this even mean? Well, pi is the Mathematical Calculation used to find area in geometric shapes, 2D and 3D. This calculator uses the Arcsine Function/Inverse Sine Function to find a number's, within -1 and 1, Pi. The formula used for this is: pi = 2 * (Arcsin(sqrt(1 - x^2)) + abs(Arcsin(x))). Arcsin refers to the inverse sine in radians Sqrt is is short for square root Abs is short for absolute value x^2 refers to an exponent, in this case, x squared. That's all.
Formula was found here:http://www.wikihow.com/Calculate-Pi
