find radius from chord length

[kimtp]

How do I find the radius of a circle knowing the the length of a chord? Is there additional info needed to calculate the radius?

Thanx.

Kim

[Bernie Deitrick]

Kim,

You also need to know theta, the central angle that the chord subtends. All
you can say about the radius without theta is that it is greater than or
equal to the length of the chord/2.

HTH,
Bernie
MS Excel MVP


"kimtp" <[email protected]> wrote in message
news:[email protected]...
>
> How do I find the radius of a circle knowing the the length of a chord?
> Is there additional info needed to calculate the radius?
>
> Thanx.
>
> Kim
>
>
> --
> kimtp
> ------------------------------------------------------------------------
> kimtp's Profile:
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[kimtp]

if i have the length of the chord and the distance from the chord to the arc, can i do something like (c^2 + 4*h^2)/8*h where
c= chord length
h= distance between chord and arc

[Bernie Deitrick]

Kim,

As long as the distance from the chord to the arc is along a radius and
normal to the chord, yes, you have the correct formula.

HTH,
Bernie
MS Excel MVP


"kimtp" <[email protected]> wrote in
message news:[email protected]...
>
> if i have the length of the chord and the distance from the chord to the
> arc, can i do something like (c^2 + 4*h^2)/8*h where
> c= chord length
> h= distance between chord and arc
>
>
> --
> kimtp
> ------------------------------------------------------------------------
> kimtp's Profile:
http://www.excelforum.com/member.php...o&userid=23930
> View this thread: http://www.excelforum.com/showthread...hreadid=375623
>

[kimtp]

thanx for the help.