I'm assuming it's a circle as you said diameter. 0/5 of 9 is 4.5 which is the radius.
pi x r2 is 63.62m2
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A circle with a diameter of 220 meters has an area of 38,000 square meters.
The answer is 7,068 m2.
The answer is 28,274 m2.
2*2 = 4 square meters
a circle having a diameter of 1.4732 meters has an area of about 1.7 square meters.