Question

координаты a(4;3;3) b(-7;-4;6) c(5;3;-3)

Answer 1

$A(4,3,3); ,; ; B(-7,-4,6); ; ,; ; C(5,3,-3)\\\.[, overline {AB}times overline {AC}, ]=left|begin{array}{ccc}i&j&k\-11&-7&3\1&0&-6end{array}right|=42i-63j+7k\\\|, [, overline {AB}times overline {AC}, ], |=sqrt{42^2+63^2+7^2}=sqrt{5782}=7sqrt{118}\\\S(Delta )=frac{7}{2}cdot sqrt{118}$