Parameterize the plane that contains the three points Use s and t for the parameters in your parameterization and enter your formula as a single vector, with angle brackets, for example, $\displaystyle{\langle 1 + s + t, s - t, 3 - t \rangle}$. Each component should be a function of the form a+bs+ct where a,b,c are appropriate real numbers. $\vec{r}(s,t)$ =