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Brahmagupta's formula
In geometry, Brahmagupta's formula gives the area of a cyclic quadrilateral whose sides have lengths a, b, c, d as:
- <math>\sqrt{(s-a)(s-b)(s-c)(s-d)}</math>
where s=(a+b+c+d)/2.
Heron's formula for the area of a triangle is the special case obtained by taking d=0.
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