SOLUTION: if ab=13 and bc=5 then must ac=18?

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Question 1001320: if ab=13 and bc=5 then must ac=18?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if ab=13 and bc=5 then must ac=18?
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No.
c might be between a and b.
Or a, b & c might not be colinear.