<?xml version="1.0" encoding="UTF-8"?>
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          /|
         / |
        /  |
       /___|
      A    C
     /     |
    /______|
   B       D


D ----- C
|       |
|       |
A ------B

The scroll encodes the InterceptTheorem .</opaque><mref name="[http://mathhub.info/FrameIT/frameworld?ParallelLines]" target="http://mathhub.info/FrameIT/frameworld?ParallelLines"><metadata><link rel="http://cds.omdoc.org/mmt?metadata?sourceRef" resource="http://mathhub.info/FrameIT/frameworld/Scrolls/ParallelLines.mmt#290.27.0:309.27.19"/></metadata></mref></omdoc>