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The diameter is 7.817 units.
A circle with a diameter of 2.5 units has a circumference of 7.9 units.
If the diameter is 9 units then the radius (not raduis) is 4.5 units.
The circle's diameter is 8.291 units.
circumference = π × diameter = π × 192 units = 192π units ≈ 603 units