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ত্রিভুজের যেকোন তিন বিন্দুর জন্য সাধারণ ভাবে সূত্রটি হলো: S = 1 2 | det ( x A x B x C y A y B y C 1 1 1 ) | = 1 2 | x A y B − x B y A + x B y C − x C y B + x C y A − x A y C | . {\displaystyle S={\frac {1}{2}} \left|\det {\begin {pmatrix}x_{A}&x_ {B}&x_{C}\\y_{A} &y_{B}&y_{C} \\1&1&1\end {pmatrix}}\right|= {\frac {1}{2}}{\big |}x_{A}y_{B}-x_{B}y_ {A}+x_{B}y_{C}-x_ {C}y_{B}+x_{C}y_{A} -x_{A}y_{C}{\big |}.}
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