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Ravifine
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How can i find out the radius of an arc?

05/28/2010 1:23 AM

How can i find out the radius of an arc?
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Tornado
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#1

Re: How can i find out the radius of an arc?

05/28/2010 1:34 AM

Draw two nonparallel chords of the arc. Construct the perpendicular bisectors of each chord. The intersection of the two bisectors is the center of the arc. Measure the radius.

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jdretired
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#2

Re: How can i find out the radius of an arc?

05/28/2010 4:46 AM

As stated above, GA.

Regards JD.
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Tornado
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#3
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Re: How can i find out the radius of an arc?

05/28/2010 5:05 AM

Thanks for the perfect drawing! Interestingly, all of the construction arcs can be the same radius, and can be done with the traditional "collapsing compasses" (i.e., not picking them up and using them elsewhere).

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ba/ael
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#4

Re: How can i find out the radius of an arc?

05/28/2010 4:32 PM

Draw any chord. Measure chord length L and offset h at middle of chord.

Solve R = (h2 + L2/4)/2h

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Anonymous Poster
#6
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Re: How can i find out the radius of an arc?

06/01/2010 2:56 PM

Then there's always this

http://www.handymath.com/cgi-bin/rad2.cgi?submit=Entry
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ba/ael
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#7
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Re: How can i find out the radius of an arc?

06/01/2010 8:09 PM

Yes, it works fine, but I prefer to do it using Pythagoras's Theorem because I remember it without having to remember any links.

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varunpassi
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#5

Re: How can i find out the radius of an arc?

05/31/2010 1:09 PM

the only known formula is Θ/360 * 2∏r = arc length. knowing the arc length u can find the radius.....

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