Find a unit vector with positive first coordinate that is orthogonal to the plane through the points P = (-5, 3, 3), Q = (0, 8, 8), and R = (0, 8, 12)
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Let u be the vector from P to Q and v be the vector from Q to R Then the normal to the plane is N = uxv If the x component is negative use -N To make it a unit vector use N/|N|
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