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In geometry, Bretschneider's formula is the following expression for the area of a general quadrilateral: K = − a b c d ⋅ cos 2 ⁡ {\displaystyle K={\sqrt {-abcd\cdot \cos ^{2}\left}}} = − 1 2 a b c d [ 1 + cos ⁡ ]. Wikipedia

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theorem

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quadrilateral