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# 2. Let P(3,2,1),Q(2,1,c) and R(c,1,0) be points in R3. (a) Use the cross product definition to find the area of triangle PQR in terms of

2. Let P(3,2,1),Q(2,1,c) and R(c,1,0) be points in R3.

(a) Use the cross product definition to find the area of triangle PQR in terms of c.

(b) For what values of c (if any) is PQR a right triangle?

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