Below is the graph of the plane passing through the points [math]P[/math], [math]Q[/math], and [math]R[/math]. Note that the vectors [math]\vec{PQ}[/math] and [math]\vec{PR}[/math] lie "in" the plane, and that the yellow vector (which is a multiple of [math]\vec{PR}\times{PQ}[/math]) is normal to the plane. Adjust the plane by moving the points [math]P[/math], [math]Q[/math], and/or [math]R[/math].