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geometry - Why are two planes parallel to the same line not necessarily parallel? - Mathematics Stack Exchange
![If three or more parallel lines are intersected by two transversals prove that the intercepts made by them on the transversals are proportional If three or more parallel lines are intersected by two transversals prove that the intercepts made by them on the transversals are proportional](https://haygot.s3.amazonaws.com/questions/379028_b8f16c8cd63e45659b7e721e822f3046.png)
If three or more parallel lines are intersected by two transversals prove that the intercepts made by them on the transversals are proportional
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