My Math Forum straight line

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 December 21st, 2010, 06:49 PM #1 Senior Member   Joined: Apr 2010 Posts: 451 Thanks: 1 straight line How do we draw a straight line??
 December 21st, 2010, 08:34 PM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,913 Thanks: 1112 Math Focus: Elementary mathematics and beyond Re: straight line To what degree of precision?
 December 21st, 2010, 10:59 PM #3 Senior Member   Joined: Nov 2010 Posts: 502 Thanks: 0 Re: straight line I'm pretty fond of rulers myself, though I often use the straight side of a protractor because it makes me look smarter. My father was really level-headed, and for big lines we would trace the outline of his head. What, exactly, are you looking for?
 December 22nd, 2010, 04:15 AM #4 Global Moderator   Joined: Dec 2006 Posts: 20,302 Thanks: 1972
December 22nd, 2010, 12:32 PM   #5
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Re: straight line

Quote:
 Originally Posted by skipjack
Whoa. This is a concept both new and interesting to me. On the A-Frame one, where he poses the question of whether we know why it goes in a straight line... why does it go in a straight line?

 December 23rd, 2010, 08:43 AM #6 Member   Joined: Jun 2007 From: Richmond, VA Posts: 46 Thanks: 0 Re: straight line Use a slide rule and you'll look even smarter.
 December 23rd, 2010, 09:47 AM #7 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,913 Thanks: 1112 Math Focus: Elementary mathematics and beyond Re: straight line Produce a 1-dimensional object in $\mathbb{R}^3$ and you'll look like a (trivial) genius!
 December 23rd, 2010, 08:15 PM #8 Senior Member   Joined: Nov 2010 Posts: 502 Thanks: 0 Re: straight line Perhaps we should assume the Greek's magical straightedge, which can draw a perfectly straight line between any two points no matter how far.

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