anonymous
  • anonymous
last question... maybe :p A rectangular wall has an arched entrance cut into it. Assume the arch is a semicircle. You need to wallpaper the wall. To the nearest square foot, what is the area of the wall that you will be wallpapering? *have to draw diagram first*
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
|dw:1339682800245:dw|
sasogeek
  • sasogeek
is the 10ft the whole length of the entrance?
anonymous
  • anonymous
yes

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anonymous
  • anonymous
i got 157.08 ?
ganeshie8
  • ganeshie8
u should get 441.71 sq.ft
anonymous
  • anonymous
how so?
sasogeek
  • sasogeek
the radius of the semicircle is 2, the height of the rectangular part of the entrance hence is 8, find the area of the semicircle, the area of the rectangular part of the entrance, sum it, and deduct it from the area of the whole wall
ganeshie8
  • ganeshie8
area of the wall = 16 x 30 = 480 sq.ft area of rectangle + semi circle hole = 8x4 + pi x 2 do a subtraction..

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