Jawaban:
a. BA= A-B = (5,1,3)-(2,-1,-1)= (3,2,4)
BC= C-B = (4,2,-4)-(2,-1,-1)= (2,3,-3)
BA • BC = (3,2,4) • (2,3,-3) = (6,6,-12) =0
b
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Jawaban:
a. BA= A-B = (5,1,3)-(2,-1,-1)= (3,2,4)
BC= C-B = (4,2,-4)-(2,-1,-1)= (2,3,-3)
BA • BC = (3,2,4) • (2,3,-3) = (6,6,-12) =0
b