For which segment lengths is ¯¯¯AC¯ parallel to ¯¯DE¯ ?

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Answer 1 · 2017-01-10T17:34:46

See below.

If

#bar(AC) |\ | bar(DE)#

then

#bar(AC)/bar(AB)=bar(DE)/bar(DB)#

and

#bar(AC)/bar(BC)=bar(DE)/bar(BE)#

and

#bar(BC)/bar(AB)=bar(BE)/bar(DB)#