A simple area

Draw a straight line from (0, 0) to (0, 6). This is the triangle's base. It has a length of 6.

Now drop a perpendicular to this from (3, 3). It has a length of 3. This is the triangle's height.

Area of triangle = 1/2 * base * height = 1/2 * 3 * 6 = 9

By using matrix,,,,,we can do it... $\begin{bmatrix} 0 & 0 & 1 \\ 0 & 6 & 1 \\ 3 & 3 & 1\end{bmatrix}$

Next step $\begin{bmatrix} 0 & 6 \\ 3 & 3\end{bmatrix}$

So →( $0 \times 3$ ) + ( $6 \times 3$ ) =0+18=18

So, the area of that triangle 0.5*18=9(Ans)