SOLUTION: If DF=15 and DE=6, Find EF if E is between D and F.

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Question 160266: If DF=15 and DE=6, Find EF if E is between D and F.
Answer by HyperBrain(694) About Me  (Show Source):
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Flashback::
Definition of betweeness>>
B is between A and C if
(a) A, B, amd C are collinear, and;
(b) AB+BC=AC
so if E is between D and F, then
DE+EF=DF
but,
DF=15 and DE=6
thus,
6+EF=15
6-6+EF=15-6
EF=9

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