$\"\"$

From the diagram the vertices are (0, 0), (4, 5) and $\"\"$ .

Let $\"\"$

(Apply area of a triangle formula: $\"\"$ )

Area = $\"\"$ (Substitute the points) $\"\"$

First we can find the determinant

$\"\"$ $\"\"$

Area = $\"\"$

$\"\"$ square units $\"\"$

The area of the triangle is $\"\"$ square units.