General Brahmagupta's Formula Help

This calculator uses Brahmagupta's Formula to solve the area of a quadrilaterial. This version of the formula requires the user to know the four side lengths and the angle measures between formed by points a and d and the points b and c. The formula used is:

Area = sqrt((s-a)(s-b)(s-c)(s-d) - abcd cos²[1/2(A+B)])

Where:

a = side length
b = side length
c = side length
d = side length
A = angle between points a and d
B = angle between points b and c
s = semiperimeter = (a+b+c+d)/2

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