Circle simple

Circumference of a circle is 6.28. What is the area of the circle?

Result

S =  3.138

Solution:

p=6.28 p=2π r r=p/(2π)=6.28/(2 3.1416)0.9995 S=π r2=3.1416 0.999523.1384=3.138p = 6.28 \ \\ p = 2 \pi \cdot \ r \ \\ r = p/(2 \pi) = 6.28/(2 \cdot \ 3.1416) \doteq 0.9995 \ \\ S = \pi \cdot \ r^2 = 3.1416 \cdot \ 0.9995^2 \doteq 3.1384 = 3.138



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