A quick super accurate way to divide the circumference of a circle.
Just find the number of points you want to divide the circle into in the list below and multiple the radius by the value (e.g. 5 slices of a 4" diameter circle would be 2 * 1.1756) then set your calipers/compass
3: 1.7321
4: 1.4142
5: 1.1756
6: 1.0000
7: 0.8678
8: 0.7654
9: 0.6840
10: 0.6180
11: 0.5635
12: 0.5176
13: 0.4786
14: 0.4450
15: 0.4158
16: 0.3902
17: 0.3675
18: 0.3473
19: 0.3292
20: 0.3129
The multipliers above were calculated with the following formula
DEG = 360/n where "n" is how many points around the circle you want
sin(DEG/2)*2 = your multiplier
Here is a link to Jack Houweling's page: https://www.youtube.com/user/Jacka440 I highly recommend you check it out.
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