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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 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 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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Posted on Jan 02, 2017

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if you have a circumference of 12 inches then the dia is calculated 12 inches = dia x PI to get the diameter , divide the 12 inches by PI and that will be the diameter so that is 12 divided by 3.1417 =3.819 inches
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