Is There a Proof for Congruent Segments on Any Transversal with Parallel Lines?

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SUMMARY

The theorem states that if three parallel lines intercept congruent segments on one transversal, they will intercept congruent segments on any transversal. The proof provided indicates that for three parallel lines cut by a transversal where segments AB and BC are equal, another transversal will also cut the parallel lines in the same ratio, leading to the conclusion that segments DE and EF will also be equal. This establishes a definitive relationship between the segments across different transversals.

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susanasarandon
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Our professor has challened us to find the proof for the following theorem:

If three parallel lines intercept congruant segments on one transversal, then they intercept congruant segments on any transversal.

He says it's not anywhere he's read. Help!
 
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I'll prove the theorem for you,

For any three parallel lines cut by a transversal, where AB = BC,
then another transversal will cut the parallel lines in the same ratio.

IF AB = BC, then DE = EF

I hope that's sufficient proof, i would of liked to shown a diagram, however, I'm limited by the medium I'm using.


AEK
 

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