Regular polygon circumscribed to a circle Calculator

Calculates the side length and area of the regular polygon circumscribed to a circle.

Regular polygon circumscribed to a circle
number of sides n
    1. n=3,4,5,6....
inradius r

side length a
    1.  
polygon area Sp
    1.  
circle area Sc
    1.  
area ratio Sp/Sc
    1.  
    Regular polygon circumscribed to a circle
    [1-10] /20Disp-Num
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    [1]  2019/08/10 22:45   Male / 50 years old level / An engineer / Very /
    Purpose of use
    determining the smallest size of turntable to support 36 tracks on an HO scale model railroad
    [2]  2019/04/05 21:52   Male / 60 years old level or over / A retired person / Very /
    Purpose of use
    Central play station game piece planning
    [3]  2019/02/20 05:14   Male / 20 years old level / High-school/ University/ Grad student / A little /
    Purpose of use
    Wished that you could enter a perimeter and it give you a radius
    [4]  2018/06/09 21:47   Male / 60 years old level or over / A retired people / Very /
    Purpose of use
    Used to create a Pentagon for a power tool workstation with the biggest possible sides. Thanx for the calculator and the effort.
    [5]  2018/03/21 00:04   Male / 60 years old level or over / An engineer / Useful /
    Purpose of use
    Building a wooden frame. Didn''t want to spend the time to derive calculations myself.
    [6]  2018/03/20 20:37   Male / Under 20 years old / High-school/ University/ Grad student / - /
    Comment/Request
    area of regular polygon circumscribed about the circle
    [7]  2017/09/13 20:17   Male / 50 years old level / Others / Very /
    Purpose of use
    Cutting out a clock face
    [8]  2017/08/06 01:24   - / 60 years old level or over / Others / Very /
    Purpose of use
    Building a telescope to hold a 12.5 in. mirror. To build a 15 sided tube over a 14 inch sonotube (inside diameter), with walls 1/8 in. thick. so that sonutube can act as a bearing for the focuser holder part of the tube.
    [9]  2017/06/03 09:01   Male / 20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Finding size of center post needed to fit eight 1-inch flat plates in an octagon shape around it
    [10]  2017/05/17 02:57   - / 50 years old level / A retired people / Very /
    Purpose of use
    To find the size of a concrete base required to support a round tank of diameter 12'

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