For regular shapes, you simply add the sides together, for circle, is pi x diameter.
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The answer depends on what the shape is and what information (diameter, circumference, area, volume, analytical equation, etc) is available.
There isn't any. The circumference is just a special name for a perimeter of a round shape.
Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.Calculate the circumference as 2 x pi x radius.
The circumference of EVERY circle is (pi) times (the diameter).Now you can calculate the circumference of not only that particular circle, butalso the circumference of any other circle that you'll ever meet in the future.
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!