Question

por favor
determina a área da figura abaixo

Answer 1

Resposta:

Explicação passo-a-passo:

Sejam A(-2, -2), B(4, 1) e C(-1, 5)

$A=\frac{1}{2}\left|\begin{array}{cccc}xA&xB&xC&xA\\yA&yB&yC&yA\\\end{array}\right|^{-}_{+}  \\\\\\A=\frac{1}{2}\left|\begin{array}{cccc}-2&4&-1&-2\\-2&1&5&-2\\\end{array}\right|^{-}_{+}  \\\\\\A=\frac{1}{2}|-2.1+4.5-1.(-2)-(-2).4-1(-1)-5(-2)|\\\\A\frac{1}{2}|-2+20+2+8+1+10|\\\\A=\frac{1}{2}|39|\\\\A=\frac{39}{2}$