Question

determine a área de um triângulo de vértices A (1,1) B (6,3) e C (3,5)​

Answer 1

Resposta:

$\frac{1}{2}. \left[\begin{array}{ccc}1&1&1\\6&3&1\\3&5&1\end{array}\right]$

$\frac{1}{2}|1.3.1+1.1.3+6.5.1-(3.3.1+5.1.1+6.1.1)|$

$\frac{1}{2}.|3+3+30-(9+5+6)|$

$\frac{1}{2}|36-20|$

$\frac{1}{2}.|16|$

$\frac{16}{2}$

$8$

bons estudos!