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**siva.eas****Member**- Registered: 2005-09-17
- Posts: 166

Suppose you are solving a ruler and a straigtedge construction. Do you have to assume the compass is collaspible eventhough Euler proved it is possible to copy a line segment with a collaspible. Do I have to copy a line segment using Euler's method or could I just lift the compass and move it to another place and draw the segment?

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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,332

If you want to duplicate the length of a line segment, you just need a compass.

If you also want the same direction, construct a parallel line first.

**X'(y-Xβ)=0**

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