- #1

meadow

- 19

- 0

The problem says: Find a vector N that is perpendicular to the plane determined by the points P(0,1,0), Q(-1,1,2), R(2,1,-1), and find the area of triangle PQR.

I know that the cross product of two vectors is perpendicular to the plane of a and b, so do I just cross the three vectors. I tried PxQ and then (PxQ)xR, but I didn't get the correct answer.

Also, how would you find the area of the triangle? I tried finding the distance of PQ and PR, multipying and dividing by 2, but I still didn't get the correct answer.

Any help?