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Rectangle with Triangle PMR
$M$ is the midpoint of the side of the rectangle, so $RM$ has length $2$ units.

Letting RM be the base of the triangle:
\begin{eqnarray} \text{Area of Triangle } PMR & = & \frac{1}{2} \times \text{base} \times \text{height} \\ & = & \frac{1}{2} \times 2 \; \text{units} \times 3 \; \text{units} \\ &=& 3 \; \text{square units}\end{eqnarray}
This problem is taken from the UKMT Mathematical Challenges.
You can find more short problems, arranged by curriculum topic, in our short problems collection.