**(a) Find a nonzero vector orthogonal l to the plane the points P, Q, and R, and **

**(b) find the area of triangle PQR.**

**P(1 , 0, 1), Q(- 2,1, 3), R(4, 2, 5)**

**Answer:**

**(a) Find a nonzero vector orthogonal l to the plane the points P, Q, and R, and **

**(b) find the area of triangle PQR.**

**P(1 , 0, 1), Q(- 2,1, 3), R(4, 2, 5)**

**Answer:**