Question

Area em centímetros quadrados do triangulo A(4,4) B(-4,1) C(2,0)?.

Answer 1

Resposta:

A = 13 cm²

Explicação passo a passo:

$A=\frac{1}{2} \left|\begin{array}{cccc}4&-4&2&4\\4&1&0&4\end{array}\right|_{+}^{-}\\\\A=\frac{1}{2}|4.1-4.0+2.4-4.(-4)-1.2-0.4| \\\\A=\frac{}{} \frac{1}{2} |4-0+8+16-2-0|\\\\A=\frac{1}{2} |26|\\\\A=\frac{1}{2}.26\\\\A=13$13