Вектора
BA ( 2-1; 1-6 ) BA( 1; -5)
BC (9-1;7-6) BC ( 8;1)
S ABCD = | BAxBC | = | 1*1 - 8*(-5) | = 41
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Вектора
BA ( 2-1; 1-6 ) BA( 1; -5)
BC (9-1;7-6) BC ( 8;1)
S ABCD = | BAxBC | = | 1*1 - 8*(-5) | = 41