Find area of the triangle with vertices at the point given in each of the following:(iii) $(-2,-3),(3,2),(-1,-8)$

Area $=\frac{1}{2}\left|\begin{array}{ccc}-2 & -3 & 1 \\ 3 & 2 & 1 \\ -1 & -8 & 1\end{array}\right|$

$=\frac{1}{2}[-2(10)+3(4)-22]$

$=15$ sq. Units