the units fro circumference are cm
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A circle with a radius of 45 units has a circumference of 282.74 units.
A circle with a radius of 5 units has a circumference of 31.42 units.
A circle with a diameter of 2.5 units has a circumference of 7.9 units.
A circle with a radius of 3.3 units has a circumference of 20.73 units.
circumference = π × diameter = π × 192 units = 192π units ≈ 603 units