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The formula for a circle's area is pi*radius*radius.

The diameter is equal to two times the radius.

D = 2*radius

So, the radius is 4.5 cm

Area = pi*radius*radius = 3.14159 * 4.5cm * 4.5cm = 63.617 cm2

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Q: What is the area of a circle if its diameter is 9 centimeters?
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