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The circumference of a circle is given by the formula C = 2Ï€r, where r is the radius of the circle.
In this case, the radius (r) is 90000.
Using the formula, we can calculate the circumference:
C = 2Ï€(90000)
C = 180000Ï€
Therefore, the circumference of a circle with a radius of 90000 is 180000Ï€, or approximately 564,336.49.