To solve part (c) of the problem, we need to find the area of triangle $OAB$, where $O$ is the origin. We need the coordinates of points $A$ and $B$ to use the formula for the area of a triangle with given vertices.

The formula for the area of a triangle with vertices $O = (0, 0)$, $A = (x_1, y_1)$, and $B = (x_2, y_2)$ is given by:

$\text{Area} = \frac{1}{2} \left| x_1 y_2 - x_2 y_1 \right|$

Please provide the coordinates of points $A$ and $B$ so I can calculate the area of the triangle.