You take the radius (or diameter). If radius you times it by two (since it is half of the Diameter) then times the answer by 3.14. If diameter, times the diameter by 3.14. then round the decimals.
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You need to know diameter of each circle, which are different for each circle; each circle circumference is pi x diameter where pi = 3.14159
The radius of the circle is 7.
For any circle in a plane, the ratio of circumference to diameter is a number called pi, approximately 3.14.
Using the Circumference And Area.
It means drawing a circle around a polygon in such that each vertex of the polygon is on the circumference of the circle.