It is the centre of a circle
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Circumference of a circle divided by its diameter is equal to pi
That shape is called a circle.
Circumference (distance around) is equal to pi (3.14) times the diameter. Diameter (distance across a circle) is twice the radius (distance from center to edge. 2 x 15= diameter of 30. 30 times 3.14= 94.2 meters for the circumference.
Yes. In a perfect sphere the centre is an equal distance from any point from the surface.
If you mean the distance around the circumference then you multiply the length of the diameter by Pi. (Pi is a constant roughly equal to 3.14)