## Precalculus (6th Edition) Blitzer

The area of the triangle is $10\text{ sq}\text{.units}$.
Consider the given points, $\left( -3,-2 \right),\left( 2,-2 \right),\left( 1,2 \right)$ and sketch the graph. By observing the graph, we see that the base of the triangle is $2-\left( -3 \right)=5\text{ unit}$ and the height is $2-\left( -2 \right)=4\text{ unit}$. Therefore, the area of the triangle is \begin{align} & A=\frac{1}{2}bh \\ & =\frac{1}{2}\left( 5 \right)\left( 4 \right) \\ & =10 \end{align} Hence, the area of the triangle is $10\text{ sq}\text{.units}$.