anonymous
  • anonymous
A circular pool has radius 7.1 meters. You want to build a cement walkway all the way around it and you have enough cement for 33 square meters. How wide can you make your walkway? Give your answer to the nearest centimeter.
Mathematics
katieb
  • katieb
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amistre64
  • amistre64
take the circomference of the pool and see what that measures
amistre64
  • amistre64
or...or...... you have the area of 2 circles to find, one insid ethe other
amistre64
  • amistre64
Area larger circle - Area smaller circle = 33

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amistre64
  • amistre64
pi(R^2) - pi(r^2) = 33 r = 7.1
amistre64
  • amistre64
pi(R^2 - (7.1)^2) = 33 solve for R
anonymous
  • anonymous
I got \[\sqrt{61}\]
amistre64
  • amistre64
you got? prove it :)
anonymous
  • anonymous
lol ok hold on
anonymous
  • anonymous
YAYY
amistre64
  • amistre64
yay!! was we right?
anonymous
  • anonymous
YES! :)
anonymous
  • anonymous
you are soo much more helpful than my teacher
anonymous
  • anonymous
i learn more from you than i do form 2 hours of class
amistre64
  • amistre64
we must be what they wrote about when they defined genius in the dictionary :)
anonymous
  • anonymous
lol
amistre64
  • amistre64
I forget more in 2 hours than I ever dreamed of learning :)

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