Neither radis nor rafius are recognised words in the English mathematical language.
I suggest you check and amend your spellings and resubmit the question.
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If you have the radius of the circle then just plug it into the equation which ispi x r2This equation is used to find the area of a circleSo if your radius is 5 then all you do is 52 and then multiply by piHope that helps.Jamz159
You will have to measure some part of the circle. As long as you have absolutely no information about a circle, you can't do any calculations.
Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.
Divide the circumference by the value of Pi - that will give you the diameter.
To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.