A circle with a radius of 4.5 centimetres has a circumference of 28.27 centimetres.
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A circle with a radius of 45 units has a circumference of 282.74 units.
The idea is to multiply the diameter by pi.
The circumference of a circle with a diameter of 45 inches is 141.37 inches.
A 45-foot circumference circle has an area of: 161.1 square feet.
An eighth of the area of the circle which, since neither its radius, diameter nor circumference are known, is an unknown quantity.