anonymous
  • anonymous
help!
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
anonymous
  • anonymous
1 Attachment
Astrophysics
  • Astrophysics
We just need to divide the area of the circle by the area of a square, so what is the area of a square and circle?

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anonymous
  • anonymous
4?
Astrophysics
  • Astrophysics
No..I mean what's the formula
anonymous
  • anonymous
how do i find the formula?
Astrophysics
  • Astrophysics
Area of a square is side * side right? So we can say \[A_{\square} = a^2\] and area of a circle is \[A_{circle} = \pi r^2\]
anonymous
  • anonymous
im confused, i dont know what the formula is
anonymous
  • anonymous
Astrophysics
  • Astrophysics
Geny, I provided you the formulas, you learn this in elementary. You just remember them for now, now since the radius is half the size of the side of a square we will let 2r be the side of the square, so we have a = 2r putting it all together we have \[A_{\square} = (2r)^2~~~~A_{circle}=\pi r ^2\]
anonymous
  • anonymous
ok then what
Astrophysics
  • Astrophysics
So we have \[\frac{ \pi r ^2 }{ (2r)^2 }\]
anonymous
  • anonymous
ok
Astrophysics
  • Astrophysics
So plug in the values and evaluate.
anonymous
  • anonymous
can you help me with that though please
anonymous
  • anonymous
i think its A
anonymous
  • anonymous
the area of square is 64, right? @Astrophysics
Astrophysics
  • Astrophysics
Yes.
anonymous
  • anonymous
ok so then 4 x 2/8 x 2?
anonymous
  • anonymous
myininaya
  • myininaya
@geny55 have you found the area that is in the square but not in the circle?
myininaya
  • myininaya
hint: to find that area you will need to find the difference between the square's area and the circle's area
myininaya
  • myininaya
notice the square's side length is given by (4+4) and the circle's radius is given by 4 it should be pretty easy to find the areas of both the square and circle now and you want to know the difference of these areas over the squares area

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