Posted by Shadow on Thursday, September 9, 2010 at 8:57pm.
Through a given point on a line, there is one and only one line perpendicular to the given line.
The hints that it gave was "Do not limit your thinking to just two dimensions". If it just a regular line there will only be one perpendicular line right?

Math  bobpursley, Thursday, September 9, 2010 at 9:18pm
hold a pencil up. A real pencil. I bet you can make perpendiculars in many directions, because the pencil is in a three dimensional space.

Math  Shadow, Thursday, September 9, 2010 at 9:29pm
I don't get what you mean by holding up a pencil. I hold up one and I don't see anything?
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