Предмет: Математика, автор: kraeva890405177

Даны три точки:
А(-1;-1;1)
В(3;0;1)
С(0;1;0)
Найти площадь треугольника АВС
пожалуйста, помогите срочно!!!!!!!

Ответы

Автор ответа: NNNLLL54
0
AB=(4,1,0),; ; AC=(1,2,-1)\\Vektornoe; proizvedenie:; [, AB,AC, ]= left|begin{array}{ccc}i&j&k\4&1&0\1&2&-1end{array}right| =-i+4j+7k\\\S_{Delta}=frac{1}{2}cdot sqrt{(-1)^2+4^2+7^2}=frac{1}{2}cdot sqrt{66}
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