jessica5465
jessica5465 jessica5465
  • 02-09-2018
  • Mathematics
contestada

Can somebody help me with these to questions how do you find the area of the circle

Can somebody help me with these to questions how do you find the area of the circle class=

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tramserran
tramserran tramserran
  • 02-09-2018

13)

Circumference (C) = 2π·r

11π = 2π·r

11/2 = r

******************************

Area (A) = π·r²

             =  π·(11/2)²  

            = 121π/4

           ≈ 94.985 in²

14)

diameter = 2r

          42 = 2r

           21 = r

*******************

Area (A) = π·r²

             =  π·(21)²  

            = 441π

           ≈ 1384.74 in²

***************************

$280/1384.74 in²

x = $0.20

Answer: about 20 cents per square inch

 



                     

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