Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Calculating Pi using polygon sides sum / radius
Replies: 40   Last Post: Aug 2, 2013 5:27 PM

 Messages: [ Previous | Next ]
 JT Posts: 1,448 Registered: 4/7/12
Re: Calculating Pi using polygon sides sum / radius
Posted: Aug 1, 2013 5:33 PM

Den torsdagen den 1:e augusti 2013 kl. 23:23:51 UTC+2 skrev jonas.t...@gmail.com:
> Den torsdagen den 1:e augusti 2013 kl. 23:19:22 UTC+2 skrev Virgil:
>

>
> >
>
> > jonas.thornvall@gmail.com wrote:
>
> >
>
> >
>
> >
>
> > > Well i do not intend to use any trigonometric functions, and honestly i
>
> >
>
> > > always thought the ancients, did geometry *the correct way* not losing
>
> >
>
> > > precision. By double up vertices and using fractions.
>
> >
>
> >
>
> >
>
> > They did things "the correct way" so throughly, that they couldn't
>
> >
>
> > even find the length of the diagagonals of a unit square.
>
> >
>
> > --
>
>
>
> Sure they could.

They had no problems calculating the center to vertice diagonal for any polygon, and without the use of trigonometric functions i may add.

Their geometric calculations used exact fractions instead of halfbaked decimals.

Date Subject Author
7/30/13 JT
7/30/13 JT
7/30/13 Peter Percival
7/30/13 JT
7/30/13 Richard Tobin
7/30/13 JT
7/30/13 Peter Percival
7/30/13 JT
7/30/13 JT
7/30/13 JT
7/30/13 JT
7/31/13 William Elliot
7/31/13 JT
7/31/13 Peter Percival
7/31/13 William Elliot
8/1/13 JT
8/1/13 JT
8/1/13 Virgil
8/1/13 Virgil
8/1/13 JT
8/1/13 JT
8/1/13 Virgil
8/1/13 JT
8/1/13 Virgil
8/1/13 Virgil
8/1/13 Shmuel (Seymour J.) Metz
8/1/13 Virgil
8/2/13 JT
8/2/13 JT
8/2/13 Virgil
8/2/13 JT
8/2/13 Virgil
8/2/13 Brian Q. Hutchings
8/2/13 Brian Q. Hutchings
8/2/13 Virgil
8/2/13 JT
8/2/13 Shmuel (Seymour J.) Metz
8/1/13 JT
8/1/13 Virgil
8/1/13 JT
8/1/13 Virgil