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if the area of a cirle is 804 what is the radius

The circle has an area of 256π what is the radius and diameter?
 

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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
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A=pi*r^2  (formula for the area of a circle)
256*pi=pi*r^2
divide both sides by pi
256=r^2
take the square root of both sides
r=16, the radius, and the diameter d=2*16=32