Question

Calculati Aabc A(4,3) B(5,3) C(2,5) ​

Answer 1

Explicație pas cu pas:

$\left|\begin{array}{ccc}4&3&1\\5&3&1\\2&5&1\end{array}\right| = 12 + 6 + 25 - 6 - 20 - 15 = 2$

$A_{ABC}=\frac{1}{2} \times |\left|\begin{array}{ccc}4&3&1\\5&3&1\\2&5&1\end{array}\right|| = \frac{1}{2} \times |2| = \frac{2}{2} = 1$