Incircle of a triangle Calculator

Calculates the radius and area of the incircle of a triangle given the three sides.

Incircle of a triangle
side a
side b
side c

inradius r
    1.  
diameter φ
    1.  
incircle area Sc
    1.  
triangle area St
    1.  
area ratio Sc/St
    1.  

    Incircle of a triangle
    [1-4] /4Disp-Num
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    [1]  2018/05/30 03:15   Female / 30 years old level / An engineer / Useful /
    Purpose of use
    Calculating useful area of patio shade.
    Comment/Request
    The inverse would also be useful but not so simple, e.g., what size triangle do I need for a given incircle area.
    [2]  2018/03/12 11:01   Male / 60 years old level or over / An engineer / - /
    Purpose of use
    As the previous comment stated, this was used to find the circular radius of the USPS Medium Tube (which ironically is a triangular prism) for the purposes of shipping items of circular cross-section (cylinders). The answer was about 1.5 inches, so the "tubes" are way too small for the items I wanted to ship inside. But that''s perfect for blueprints, its designed application.
    [3]  2017/06/11 18:21   Female / 30 years old level / A homemaker / Very /
    Purpose of use
    To see how big a triangular cabinet needs to be to store my dinner plates.
    Comment/Request
    Thanks!
    [4]  2016/12/09 15:01   Male / 20 years old level / A homemaker / Very /
    Purpose of use
    Shipping large photo prints in triangular "tubes" and wanted to know the equivalent diameter when compared with actual circular tubes

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