anonymous
  • anonymous
An architect created a plan for a four story building with a central courtyard. The building measures 96 feet on each side. The courtyard measure 40 feet on a side. His clients asked him to work out an alternative design with the same volume but without the courtyard. Find the side length of such a building if it is designed as a four-story square prism. Any help would be wonderful thanks.
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
the picture is sideways sorry
anonymous
  • anonymous
Hi! :) Well, let's get the volume of the hollow prism first. Let h be the height of the building. The rectangular prism without the courtyard would has a volume of (96 ft)(96 ft)(h ft)=9216h ft^3. Now, with the courtyard, imagine cutting out the center of a sytrofoam box. The volume would then be the original minus the removed center. Therefore, the volume of the building WITH the courtyard would have to be VOL w/o courtyard - VOL of courtyard = VOL of initial plan of architect. The volume of the courtyard is (40 ft)(40 ft))(h ft)=1600h ft^3. VOL of initial plan, therefore, is 7616h ft^3. From there, we can answer the problem. The side length is asked. Without any courtyard, we want to achieve the same volume as before. Let s be the side length. 7616h ft^3 = (s ft)(s ft)(h ft) 7616h ft^3 = (s^2)(h) ft^3 7616 = s^2 s= sqrt (7616) ft
anonymous
  • anonymous
Thank you soooooo much (:

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anonymous
  • anonymous
You're welcome! :) Good luck with math!
anonymous
  • anonymous
wait but isnt 96 the height of the building?
anonymous
  • anonymous
I guessed 96 and 40 were the sides of the building. As in the sides of the square. Isn't that what the question means?
anonymous
  • anonymous
The courtyard measure 40 feet on a side. I just dont understand this question
anonymous
  • anonymous
Me too. Lol.

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