How to calculate the circle of the apartment

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The surrounding area of ​​the apartment

The length of a circle with a radius length "r" is two pi solids of the length of the radius ..

(Pi = 3.14 is taken.

The surrounding area of ​​the apartment yorumlar (0) 2011-12-25 20:29:43, Güzel: 17 , Kötü: 16