Hiitsmee
Hiitsmee Hiitsmee
  • 22-04-2017
  • Mathematics
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rhinomill rhinomill
  • 22-04-2017
Its either A or B.  I think its A
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BackPacker99
BackPacker99 BackPacker99
  • 22-04-2017
I am not sure what 8 means, but I can help you with 9.  

The formula for the area of a circle in pi r^2, but we do not know what the radius is.  We do, however, know that the diameter is 40.  The radius is half the diameter, so we can divide 40 by 2 to get the radius.  This is equal to 20.  Now we plug that into the formula.

pi 20^2 = 400 pi square feet.  So the answer is C.
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