EXERCISE 3 (6/32). (a) (2 points) Find the parametric equation of the plane passing through the points P (1,0,0), Q (0, 1,0) and S= (0,0,1). Determine a point belonging to the plane and whose distance from P is equal to √2. (b) (1 points) Consider the following parametric surfaces 71(s, t)= 72(s, t)= 0≤x≤ 1,0