drawing CIRCLE when i only know the chord length and number of chords

[dieselguy65]

i am trying to draw a circle,  based on only knowing the chord length of 0.625" and the fact it has 48 equal chords.

I do not know the radius of the circle.

i have a formula to figure it out. 

but i thought it would be  simple thing to draw with the information i have been given.

2 days of failed attempts has me asking if its possible, without first doing the math manually to figure out the radius of the circle.

and if it is , could someone lead me in the right direction to get started?

thanks

[HughesTooling · Accepted solution]

does this work?

Mark

[dieselguy65]

those are the numbers i got when i run the formula on paper.

but i am not sure how to get ti transferred to the computer. 

other than using the paper results, to draw a circle 7.556" in diameter and placing the chords on it.

but i was trying to do it, knowing the chord length, and number of them, that also tells me the angle between them..

i was drawing two chords, of the correct length, with the angle, and trying to pattern that.

but without having the circle center defined it wasnt working

i can draw a line, from the chord ends, to a common point, that would be the center, forming  a triangle with angles of 86.25, 86.25 and 7.5 degrees, with the base being the chord length.

if that even makes sense.

i was hoping for a way for fusion to find me the center of it.

my other way was to make a circumscribed 48 side polygon, after i calculated the radius

[wersy]

Why don't you take the center first.
Draw two lines of equal length from the center at an angle of 7.5°.
Close the two lines at the end with a line to a triangle.
Measure this line with length of 0.625
This automatically results in the radius.

[davebYYPCU · Accepted solution]

With just Your particulars, 

48 sided polygon, dimension a leg, orientate as desired.

Might help....

[dieselguy65]

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@wersy wrote:

Why don't you take the center first.
Draw two lines of equal length from the center at an angle of 7.5°.
Close the two lines at the end with a line to a triangle.
Measure this line with length of 0.625
This automatically results in the radius.

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i can do that. but was looking for a way with only the info i was given. without having to find any other angles or lengths.

[dieselguy65]

that works great. if only i could have been able to see the tooltip. i would have found it i am sure

i was trying the inscribed and circumscribed style.

never used the one below it.

thanks

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@davebYYPCU wrote:

With just Your particulars, 

48 sided polygon, dimension a leg, orientate as desired.

Might help....

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[chrisplyler]

Based only on info given in your first post...