If you take pi as 22/7 the the circumference is 242 cm.
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5,541.77 square cm.
In any circle, the ratio of circumference to diameter is (pi).
Diameter is the distance across a circle. The circumference of a circle is the distance around the outside of the circle.
Work it out the circumfrance of a circle is pie x the diameter!
3.9 x 3.14 m