[填空题]
The points P and R have positrvf)d ;f1(wiefa3 5 otion vectorsuwah nt,rna.2h v 3 4iy3h7n*b $ \overrightarrow{\mathrm{OP}}=\left(\begin{array}{c}2 \\ 0 \\ -1\end{array}\right)$ and $\overrightarrow{\mathrm{OR}}=\left(\begin{array}{c}-2 \\ 2 \\ 1\end{array}\right)$ .
1. Find $\overrightarrow{\mathrm{OP}} \times \overrightarrow{\mathrm{OR}}$$\left(\begin{array}{l}
a \\
b \\
c
\end{array}\right)$ a = b = c =
2. Hence find the area of the triangle OPR.
