1) Consider P(2,-1,4) Q(0,5,3) and R(-1,-3,2) in IR^3. Find the area of triangle PQR
2) Consider the two vectors v=<1,3,-1> and w=<-2,5,0>. Use the cross product to find the angle between v and w in degrees.
3) Find an equation for the plane containing the points P(5,4,3) Q(4,3,1) and R(1,5,4)
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