Find the number of square units in the area of the shaded region.

The shaded region is the triangle's area minus the white circle's area, which appears to be an inscribed circle.

However, there's a catch: We can't calculate the area of the triangle with 2 sides and 0 angles...

oh, builderbot, it's so tempting to call Q a right angle. It looks like

it's a right angle, and that would make side PR come out even.