Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

May 5th, 2014, 11:40 AM   #11
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Quote:
 Originally Posted by v8archie The problem is, that a straightedge does not have any markings on it anyway!
Right.

Quote:
 Originally Posted by v8archie And even if it did, it doesn't matter how you mark them, because it's just scaling.
I don't know about that. With a marked ruler you can make some constructions which are impossible with just a compass and straightedge. In particular, you can trisect an arbitrary angle:
Neusis construction - Wikipedia, the free encyclopedia

I believe a marked ruler gives you exactly the power of origami constructions (Huzita-Hatori).

 May 5th, 2014, 01:42 PM #12 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,690 Thanks: 2669 Math Focus: Mainly analysis and algebra The second point was that if you have a marked ruler it doesn't matter whether it is marked in centimetres, inches, planck lengths or some made up units. All are equally powerful.
May 6th, 2014, 05:00 AM   #13
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Quote:
 Originally Posted by v8archie The second point was that if you have a marked ruler it doesn't matter whether it is marked in centimetres, inches, planck lengths or some made up units. All are equally powerful.
Ah.

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