Circumcircle of a regular polygon Calculator

Calculates the radius and area of the circumcircle of a regular polygon.

Circumcircle of a regular polygon
number of sides n
    1. n=3,4,5,6....
side length a

circumradius r
    1.  
diameter φ
    1.  
circumcircle area Sc
    1.  
polygon area Sp
    1.  
area ratio Sc/Sp
    1.  
    Circumcircle of a regular polygon
    [1-9] /9Disp-Num
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    [1]  2021/03/30 04:40   60 years old level or over / A retired person / Very /
    Purpose of use
    To calculate the radius of a wheel bolt pattern
    Comment/Request
    In circumradius formula #1, I believe Pi should be replaced with 180.
    [2]  2020/10/17 11:24   20 years old level / An office worker / A public employee / Very /
    Purpose of use
    Finding correct sizing of a drill bit to convert a hand grinder to an electric grinder
    [3]  2020/10/11 15:33   40 years old level / A homemaker / Very /
    Purpose of use
    Need to figure out size of circle to cover raw edges in a quilt pattern for multiple sizes of Dresden plates.
    [4]  2020/07/21 19:26   60 years old level or over / A retired person / Very /
    Purpose of use
    Lay out raised flower bed
    Comment/Request
    I had an odd number of patio/wall blocks and wanted largest size (circular) bed they would make. It was easy to lay out once the diameter was known.
    [5]  2019/11/15 17:59   20 years old level / An engineer / Very /
    Purpose of use
    radial hydraulic pump design
    [6]  2019/04/09 01:32   30 years old level / An engineer / Very /
    Purpose of use
    A quick check to determine if a cube has enough clearance to fit inside a cylindrical tube.
    Comment/Request
    I've used this a few times now, Thanks!
    [7]  2018/06/12 22:39   Under 20 years old / Elementary school/ Junior high-school student / A little /
    Purpose of use
    Finding distance between points on circle
    Comment/Request
    Solve for a
    [8]  2018/01/06 04:48   50 years old level / High-school/ University/ Grad student / Useful /
    Purpose of use
    calculate size of rectangular prism that will fit inside a cylinder as part of designing a home made propane blacksmiths forge
    [9]  2015/08/03 14:23   20 years old level / An office worker / A public employee / Very /
    Purpose of use
    Designing satellite constellations for Kerbal Space Program

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