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the diameter would be 9 you would do 4.5+4.5 and that would = 9
It is the ratio between a circumference of a circle and the diameter (they needed a number to describe this).
The term used is pi
The three most common ways to describe the dimension or size of a circle is either the diameter or the radius or the circumference (perimeter).When the circumference is given then dividing that by Pi will give you the diameter (circumference / Pi = diameter).
The diameter of this circle would be about 9.5m