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Lenth can be the diameter passing the center point of a circle touching opposite arc, symetrcally.. A=#r^2: 25=22/7r^2: r=2.82; diametr=2.82(2) =5.64cms
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yes and its supposed to be 81π square centimeters..
sorry.. but can you please answer it for me.. were just starting our lesson about it so i don't know much of it..
If a circle has an area of 81π, then find the length of the radius..
81pie=pie x r^2; r^2=81: r=9 units
Thanks a lot ..
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