Question

calcule em casa caso a área do triângulo de vértices A(-3,5) B(-8,6) C(0,0): URGENTE

Answer 1

$\huge \: M=\begin{vmatrix}-3&5&1\\ -8&6&1\ \\0&0&1\end{vmatrix}$

$\mathsf{det~M=-3.6-5.(-8)=-18+40=22}$

$\mathsf{S_{\triangle}=\dfrac{1}{2}|det~M|}$

$\mathsf{S_{\triangle}=\dfrac{1}{2}.22}$

$\mathsf{S_{\triangle}=11~u.a}$