A circle with a radius of 18 centimeters has an area of 1017.88 square centimeters.
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It is 18 centimeters because your radius is exactly half of the diameter in any circle
circumference=pi*diameter so diameter=circumference/pi 36/pi=11.4591559
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The answer is 1017.87601976.
area of circle is πr² (3.14)(6)² 3.14 * 36 = 113.45 cm² ■