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Question

Two straight lines are parallel to the same third line; prove that they are parallel to each other also.

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Solution

LetlinesCD&EFbeparalleltothesamelineAB.NowfromthelineCDbeingparalleltoAB,itfollowsthateverypointinthelineCDmustbeequidistantfromthelineAB.AndalsolineEFbeingparalleltoAB,itfollowsthateverypointinthelineEFmustbeequidistantfromthelineAB.ThereforethewholedistancesbetweenthelineCD&EFmustbeequal.SolinesCD&EFmustbeequidistanttoeachother&consequentlybeparalleltoeachother.
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