David, that is supposed to be A-squared + B-squared = C-squared. If A=3 & B=4, C=25, as 9 + 16 = 25, and the square root of 25 is 5. It's called the Pythagorean Theorem, after the Greek philosopher who supposedly created it.
http://en.wikipedia.org/wiki/Pythagorean_theorem
The wiki article says the Babylonians knew of it, & used it, but didn't fit it into a mathematical framework. According to their article, Pythagoras arranged and prove it both mathematically and geomentrically, which is why he got the credit. LONG article... I just skimmed it.
No way around it. There WILL be math. ;) Even I cannot escape it, and if any of my teachers knew I had become a teacher, the living ones would drop dead, and the dead ones would start spinning in their graves!
Bill in OKC
--- In gingery_machines@yahoogroups.com, David Patterson <odd_kins@...> wrote:
>
> Egyptians knew about the 3,4,5 rule of a right triangle, simple geometry. If one side is 3 another is 4 then the hypotinus is exactly 5, for a right trangle. using a wheel of a known circumference a person can mark off an area if all 3 do not add up to this 3,4,5 rule it will not be exact.
> Â the formula is
> the square root of A(3)squared + B(4) squared = 5.
> Is the pyramid within 1/8" of a known dimension, doubt it. Is one side square within 1/8" to another, could be.
> Â
> Dave Patterson
> odd_kins@...
> http://home.comcast.net/~oddkins/foundry_home.html
>
> --- On Fri, 12/31/10, keith gutshall <drpshops@...> wrote:
>
>
> From: keith gutshall <drpshops@...>
> Subject: RE: [gingery_machines] new article: Making it Dead Flat and Square
> To: gingery_machines@yahoogroups.com
> Date: Friday, December 31, 2010, 2:41 PM
>
>
> Â
>
>
>
> Hi Rick
> Â Have you ever watched bricklayers?
> Â All they use is a framing square , a level and a piece of string between two points.
> Seems to work good for them.
> Â
> Â Keith
> Deep Run Portage
> Back Shop
> " The Lizard Works"
>
> --- On Fri, 12/31/10, Rick Sparber <rgsparber@...> wrote:
>
> From: Rick Sparber <rgsparber@...>
> Subject: RE: [gingery_machines] new article: Making it Dead Flat and Square
> To: gingery_machines@yahoogroups.com
> Date: Friday, December 31, 2010, 4:15 PM
>
> Â
>
> Before I would discount this figure, I would want to know how they did it. If done with something like a narrow slit and the sun shining through it, this might be reasonable.
>
> Rick
>
> -----Original Message-----
> From: gingery_machines@yahoogroups.com [mailto:gingery_machines@yahoogroups.com] On Behalf Of R.L. Wurdack
> Sent: Friday, December 31, 2010 2:10 PM
> To: gingery_machines@yahoogroups.com
> Subject: Re: [gingery_machines] new article: Making it Dead Flat and Square
>
> 1 part in 8*12*700 = 67200 =~ .000015 is really tough to swallow.
>
> D.
>
> [Non-text portions of this message have been removed]
>
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> [Non-text portions of this message have been removed]
>
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