It looks like you're working with a geometric figure involving points labeled A, B, C, D, E, and F. Let's break down the relationships you've provided:
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\( DE = \frac{1}{2} BC \) - This suggests that line segment DE is half the length of line segment BC.
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\( 2DF = AC \) - This implies that the length of segment AC is twice the length of segment DF.
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\( DF = DE \) - This states that the length of segment DF is equal to the length of segment DE.
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\( FE = \frac{1}{2} AB \) - This indicates that the length of segment FE is half the length of segment AB.
Given the relationships, we can express these segments in terms of a single variable if needed.
Let's denote:
- \( DE \) as \( x \). Then:
- \( DF = x \) (from \( DF = DE \)),
- \( BC = 2x \) (from \( DE = \frac{1}{2} BC \)),
- \( AC = 2DF = 2x \),
- \( FE = \frac{1}{2} AB \).
If you have a specific question or need to solve for specific values, please provide more context or questions related to these relationships!