Question

if A(x1,y1), B(x2,y2), C(x3,y3) are the vertices of the triangle ABC then its area is​

Answer 1

Refer to the attachment

Answer 2

Answer:

Step-by-step explanation:

$\frac{1}{2}\times \begin{vmatrix} x_1& y_1&1 \\ x_2& y_2& 1\\ x_3&y_3 & 1\end{vmatrix}$