On Feb 2, 11:16*am, "Steve B" 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

Mebbe

http://www.analyzemath.com/geometry_calculators.html

or, this looks closer

http://www.educypedia.be/education/c...orsmathadv.htm

http://www.handymath.com/cgi-bin/arc18.cgi?submit=Entry


Dave

On Feb 2, 4:16*pm, "Steve B" 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

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

"Steve B" wrote in message
...
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

You should put recurring formulas in a spreadsheet, so you have them
available.
Ahm talkin to myself here....
--
EA





Steve

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 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)

Bob Swinney

"Steve B" wrote in message ...
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

On Tue, 2 Feb 2010 11:15:23 -0500, "Existential Angst"
wrote:


Siatta? Perp height between chord and circumference? Spelling?


sagitta

--
Ned Simmons

"Existential Angst" wrote in message
...
"Steve B" wrote in message
...
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



You should put recurring formulas in a spreadsheet, so you have them
available.
Ahm talkin to myself here....
--
EA





Steve

"Robert Swinney" wrote in message
...
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



Bob Swinney

"Steve B" wrote in message
...
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

In article , Steve B
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/

On Feb 2, 11:53*am, Ned Simmons wrote:
On Tue, 2 Feb 2010 11:15:23 -0500, "Existential Angst"

wrote:
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

"Frank Warner" wrote in message
. ..
In article , Steve B
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/

Nice math site.... altho I wonder if people with enough smarts to want to
solve geometry problems would go for those bull**** diet/exercise ads....
And ackshooly, they would!

Nice knives!! That Mammoth tooth/magnesium for $977.77.... can I get it
for $977.75??
--
EA

"Existential Angst" wrote in message
...
"Steve B" wrote in message
...
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

You should put recurring formulas in a spreadsheet, so you have them
available.
Ahm talkin to myself here....
--
EA





Steve

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

"Jim Wilkins" wrote in message
...
On Feb 2, 11:53 am, Ned Simmons wrote:
On Tue, 2 Feb 2010 11:15:23 -0500, "Existential Angst"

wrote:
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

Saggita, that was it. My grey matter hard drive got full, and I had to kick
that out to put something in.

Steve

"Frank Warner" wrote in message
. ..
In article , Steve B
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.

The Marv Klotz site has free home shop software and various types of
math-related solutions

http://www.myvirtualnetwork.com/mklotz/

--
WB
..........
metalworking projects
www.kwagmire.com/metal_proj.html


"Steve B" wrote in message
...
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

In article , Steve B
wrote:

"Frank Warner" wrote in message
. ..
In article , Steve B
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:

http://www.1728.com/trig4.htm

-Frank

--
Here's some of my work:
http://www.franksknives.com/

In article , Existential Angst
wrote:

"Frank Warner" wrote in message
. ..
In article , Steve B
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/

Nice math site.... altho I wonder if people with enough smarts to want to
solve geometry problems would go for those bull**** diet/exercise ads....
And ackshooly, they would!

Nice knives!! That Mammoth tooth/magnesium for $977.77.... can I get it
for $977.75??

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!

-Frank

--
Here's some of my work:
http://www.franksknives.com/