Question

Calcule a área do triângulo de vértices A(4, 2) , B(−3,−1) e C (-5, 0)

Answer 1

$\left[\begin{array}{cc}4&2\\-3&-1\\-5&0\\4&2\end{array}\right]$
$\left|\frac{[(4*-1)+(-3*0)+(-5*2)]-[(2*-3)+(-1*-5)+(0*4)]}{2}\right|$
$\left|\frac{[(-4)+0+(-10)]-[(-6)+5+0]}{2}\right|$
$\left|\frac{(-14)-(-1)}{2}\right|$
$\left|\frac{-13}{2}\right|$
$\left|-6,5\right|$
$6,5$