A circle with a radius of 30 meters has an area of 2827.43 square meters.
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The approximate area of a circle with a diameter of 60 centimeters is 2,827.43 square centimeters.
circumference = pi*diameter so diameter = circumference/pi = 19.1 metres.
2,827.43 square cm.
diameter = 60/pi
A circle with a circumference of 60 feet has a diameter of: 19.1 feet