35.21
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If you have the radius, then area = pi*r2 which you then round to the nearest hundredth. If you do not know the radius but do know the diameter or circumference, you can calculate the radius. Otherwise you need to measure it.
725.466
236.00
.09 is 9 hundredths so it already is to the nearest hundredth.
The square root of 30 to the nearest hundredth is: ± 5.48