gabbyalicorn
  • gabbyalicorn
Bill measures the circumference of a circular fish pond to be 28 ft. What is the diameter of the fish pond, rounded to the nearest foot? Use 3.14 to approximate pi. So, 3.14 x 28 x 2 / 2 ? am i right on how i am doing this?
Mathematics
schrodinger
  • schrodinger
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tkhunny
  • tkhunny
You already know the circumference. There should be some division in there in order to find the diameter or the radius.
gabbyalicorn
  • gabbyalicorn
yes, after i get the answer which would be 175.84 then i would divide it by 2 which would be 87.92
gabbyalicorn
  • gabbyalicorn

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gabbyalicorn
  • gabbyalicorn
am i right?
Michele_Laino
  • Michele_Laino
hint: If C is the measure of the circumference, and D is the measure of the diameter, then we can write this: \[\Large C = 3.14 \times D\] so we have: \[\Large D = \frac{C}{{3.14}} = \frac{{28}}{{3.14}} = ...feet\]
tkhunny
  • tkhunny
You didn't listen. Why would the diameter be greater than the circumference. Circumference = 2 * Radius * pi Circumference = Diameter * pi Rethink!
gabbyalicorn
  • gabbyalicorn
brb for a sec
gabbyalicorn
  • gabbyalicorn
okay, back
gabbyalicorn
  • gabbyalicorn
3.14 / 28 ?
Michele_Laino
  • Michele_Laino
no, please look at formulas of @tkhunny, or at my formulas above
gabbyalicorn
  • gabbyalicorn
i did
Michele_Laino
  • Michele_Laino
we have: \[\Large D = \frac{C}{{3.14}} = \frac{{28}}{{3.14}} = ...feet\]
gabbyalicorn
  • gabbyalicorn
yes, |dw:1433357017617:dw|
Michele_Laino
  • Michele_Laino
yes! that's right!
gabbyalicorn
  • gabbyalicorn
but i did say that "3.14 / 28 ?"
Michele_Laino
  • Michele_Laino
no, it is 28/3.14=...?
gabbyalicorn
  • gabbyalicorn
8.9171974522....
Michele_Laino
  • Michele_Laino
ok!
Michele_Laino
  • Michele_Laino
so what is your answer?
gabbyalicorn
  • gabbyalicorn
8.9171974522....?
Michele_Laino
  • Michele_Laino
you have to round off that value to the nearest foot
gabbyalicorn
  • gabbyalicorn
8.917?
Michele_Laino
  • Michele_Laino
I think 9
gabbyalicorn
  • gabbyalicorn
oh beacuse you rounded
Michele_Laino
  • Michele_Laino
yes! I have rounded to the nearest foot
gabbyalicorn
  • gabbyalicorn
√ Okay, Thank you for your help!
Michele_Laino
  • Michele_Laino
:)

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