Answer:
We see 2 congruent triangles: Triangle DBC and FEC. Let's set up a proportion to find the value of x and length of DF.
Cross multiply and solve for x.
x= 5
Now to solve for the length of DF, plug in x into DF.
DF=(x+7)
DF=(5+7)
DF= 12
setting up proportionality equation:
Find DF:
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