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from GMATprep2

This topic has 1 member reply
d77 Newbie | Next Rank: 10 Posts Default Avatar
Joined
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Posted:
6 messages

from GMATprep2

Post Thu Dec 14, 2006 2:12 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    A thin piece wire 40 meters long is cut into two pieces.
    One piece is used to form a circle radius r,and the other is used to form a square.
    No wire is left over.which of thr follwing represnts the total area in squre meters of the circular and the square regions in terms of r?

    Pai*(r^2)
    Pai*(r^2)+10
    Pai*(r^2)+1\4(pai^2)(r^2)
    Pai*(r^2)+(40-2pai*r)^2
    Pai*(r^2)+(10-1\2*pai*r)^2


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    thankont Senior | Next Rank: 100 Posts
    Joined
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    Posted:
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    Post Fri Dec 15, 2006 9:49 am
    Perimeter of circle Pc = 2pi*r
    Perimeter of square Ps = 4y
    Add them up and get 40=2pi*r+4y so
    y = 10 - pi*r/2
    Answer is --e--

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