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What is the area of a semi circle the diameter is 2.500mm the radious is .425mm the circumfrence is 3000mm

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  • kenpie Oct 31, 2008

    thanks but it was not a true circle it was a sectional circle ''more like a half moon''

  • kenpie Oct 31, 2008

    Sorry its my fault for not being clear, its not the diameter its the axis 2.500 mm and the radius is 0.425, please help.

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You cannot have a semicircle that has a diameter of 2.500 mm and a radius of .425mm and a circumference of 3000mm

Circumference is equal to pi times the diameter. pi is = 3.14

The radius of a circle is always 1/2 the diameter

Area of a circle is pi time the radius squared


Loringh

Posted on Oct 31, 2008

  • Loringh
    Loringh Oct 31, 2008

    Ok, in order to calculate the area of of a non circular section, you would have to have the equation of the line, but that gets into calculus and that probably is not where you are at. BTW, just for your info so you won't thik I'm blowing smoke I used to teach high school math, Alg I, Alg II and Geometry.

    What's your situation with this problem? maybe I can still help if you can upload a sketch of the section


    Good luck Loringh


  • Loringh
    Loringh Nov 01, 2008

    This is not a simple problem. If I understand you correctly what you are trying to find is the area of an arc in a circle as defined by a chord and a perpendicular from the chord to the edge of the circle section

    Go to this web page and you will find the info you are looking for

    http://mathforum.org/library/drmath/view...

    Hope this helps Good luck Loringh


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