Posted by James on Wednesday, January 12, 2011 at 12:02pm.
The triangles are similar (but not congruent).
That means that corresponding sides are all in the same ratio.
BC/EF = 12/10 = AC/DF = 18/DF
DF = 18*(5/6) = 15
by ratios
DF/10 = 18/12
solve for DF
Please do not repost the same question without checking if your last post has been answered.
It causes unnecessary work by the tutors
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