Math site
Steve B
would just like to take the easy way out.
I had a site on my old computer that computed distance around an arc by
entering the length of the siatta and the flat measurement between the ends
of the arc.
Anyone remember that sits?
Steve
Dave__67
dca...@krl.org
Try looking at http://www39.wolframalpha.com/
It is suppose to be the bees knees. But I have not used it. Just do
not have math problems to solve.
Dan
Existential Angst
news:v6sl37-...@news.infowest.com...
Siatta? Perp height between chord and circumference? Spelling?
In case the suggested sites don't work out:
Let h be your siatta, L the chord length, r the circle radius
Then r-h is the chord to the center ( unless THIS was your siatta?).
Then (r-h)^2 + (L/2)^2 = r^2, r = (L^2/4 + h^2)/2h
Now, you can calc angles: subtended chord angle = arc cos (r-h)/r, convert
to radians, and use:
arc L = ( (angle)/2pi ) * 2 pi r = ( angle in rads) * r
You should put recurring formulas in a spreadsheet, so you have them
available.
Ahm talkin to myself here.... :(
--
EA
>
> Steve
>
Robert Swinney
The length of a chord subtending and angle is: (2 x radius x sin of 1/2 the angle)
Bob Swinney
"Steve B" <desert...@fishmail.net> wrote in message news:v6sl37-...@news.infowest.com...
Ned Simmons
<UNfi...@UNoptonline.net> wrote:
>Siatta? Perp height between chord and circumference? Spelling?
>
sagitta
--
Ned Simmons
Existential Angst
news:4b684fa1$0$31281$607e...@cv.net...
> "Steve B" <desert...@fishmail.net> wrote in message
> news:v6sl37-...@news.infowest.com...
>> I'm pretty good with algebra and trig. Yet, sometimes, I get stumped, or
>> would just like to take the easy way out.
>>
>> I had a site on my old computer that computed distance around an arc by
>> entering the length of the siatta and the flat measurement between the
>> ends of the arc.
>>
>> Anyone remember that sits?
>
>
> Siatta? Perp height between chord and circumference? Spelling?
>
> In case the suggested sites don't work out:
>
> Let h be your siatta, L the chord length, r the circle radius
> Then r-h is the chord to the center ( unless THIS was your siatta?).
>
> Then (r-h)^2 + (L/2)^2 = r^2, r = (L^2/4 + h^2)/2h
>
> Now, you can calc angles: subtended chord angle = arc cos (r-h)/r, convert
> to radians, and use:
>
> arc L = ( (angle)/2pi ) * 2 pi r = ( angle in rads) * r
Oh, yeah, better to use Swinney's first suggestion, in degrees, simpler.
But, in his second line, r would still need to be solved for, since it
wasn't given in the initial problem.
--
EA
Existential Angst
news:_v6dnV0t8egmyvXW...@giganews.com...
> The length of an arc of a circle is: [ (Pi x radius x angle) / 180 ]
>
> The length of a chord subtending and angle is: (2 x radius x sin of 1/2
> the angle)
But, r wasn't given.
--
EA
Frank Warner
<desert...@fishmail.net> wrote:
The Circle Calculator:
http://www.1728.com/circsect.htm
-Frank
--
Here's some of my work:
http://www.franksknives.com/
Jim Wilkins
> On Tue, 2 Feb 2010 11:15:23 -0500, "Existential Angst"
>
> >Siatta? Perp height between chord and circumference? Spelling?
>
> sagitta
>
> --
> Ned Simmons
What Ned said.
Sagitta is Latin for an arrow, the arc and chord resemble an undrawn
bow and string.
jsw
Existential Angst
news:020220101316295513%war...@verizonDOTnet.net...
Nice math site.... altho I wonder if people with enough smarts to want to
solve geometry problems would go for those bullshit diet/exercise ads....
And ackshooly, they would!
Nice knives!! That Mammoth tooth/magnesium for $977.77.... can I get it
for $977.75??
--
EA
Steve B
"Jim Wilkins" <kb1...@gmail.com> wrote in message
news:597d8bc2-2a7b-41a4...@c29g2000yqd.googlegroups.com...
What Ned said.
jsw
Saggita, that was it. My grey matter hard drive got full, and I had to kick
that out to put something in.
Steve
Steve B
"Frank Warner" <war...@verizonDOTnet.net> wrote in message
news:020220101316295513%war...@verizonDOTnet.net...
Hold your phone calls, folks. We do have a winner. That was it.
It really doesn't make a lot of difference, but when my boss double checks
me, I always like to be able to quote the formula or source of the answer.
Thanks, Frank.
Steve B
"Existential Angst" <UNfi...@UNoptonline.net> wrote in message
news:4b684fa1$0$31281$607e...@cv.net...
No, the one I had, you just entered the distance along a straight line from
end to end of the chord, the height at the center (siatta, sp?), and it
would give you the length of the curved chord. Used it to calculate asphalt
and sidewalk when curved streets were a mile or two long.
Steve
Steve
Wild_Bill
math-related solutions
http://www.myvirtualnetwork.com/mklotz/
--
WB
.........
metalworking projects
www.kwagmire.com/metal_proj.html
"Steve B" <desert...@fishmail.net> wrote in message
news:v6sl37-...@news.infowest.com...
Frank Warner
<desert...@fishmail.net> wrote:
> "Frank Warner" <war...@verizonDOTnet.net> wrote in message
> news:020220101316295513%war...@verizonDOTnet.net...
> > In article <v6sl37-...@news.infowest.com>, Steve B
> > <desert...@fishmail.net> wrote:
> >
> >> I'm pretty good with algebra and trig. Yet, sometimes, I get stumped, or
> >> would just like to take the easy way out.
> >>
> >> I had a site on my old computer that computed distance around an arc by
> >> entering the length of the siatta and the flat measurement between the
> >> ends
> >> of the arc.
> >>
> >> Anyone remember that sits?
> >>
> >> Steve
> >
> > The Circle Calculator:
> >
> > http://www.1728.com/circsect.htm
> >
> > -Frank
> >
> > --
> > Here's some of my work:
> > http://www.franksknives.com/
>
> Hold your phone calls, folks. We do have a winner. That was it.
>
> It really doesn't make a lot of difference, but when my boss double checks
> me, I always like to be able to quote the formula or source of the answer.
>
> Thanks, Frank.
You're welcome.
The Triangle Calculator is pretty neat, too:
Frank Warner
<UNfi...@UNoptonline.net> wrote:
LOL! It was originally $777.77 just to be a smart-ass. But, in spite of
what I told you in my email, my wife DID update the site about a year
ago and, unknown to me until a few days later, she raised all my
prices!