Question

calcule a area do triangulo de vertices A=(-3,2)B=(5,-2) e c=(1,3).

Answer 1

$<var>D=\left[\begin{array}{ccccc}-3&2&1\\5&{-2}&1\\1&3&1\end{array}\right]=6+2+15+2+9-10=24\\A=\frac{|D|}{2}=\frac{24}{2}=12</var>$