A kite frame is to be made from six pieces of wood. The four pieces that form its border have been cut to the lengths indicated in the figure. Let x be as shown in the figure. (Assume r = 6, k = 11.)   (a) Show that the area of the kite is given by the function A(x) = x

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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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A kite frame is to be made from six pieces of wood. The four pieces that form its border have been cut to the lengths indicated in the figure. Let x be as shown in the figure. (Assume r = 6, k = 11.)

 
(a) Show that the area of the kite is given by the function
A(x) = x
 
  36 − x2
 + 
  121 − x2
 
.
Using the Pythagorean Theorem, we have that the height of the upper triangles is 
 
 
 
 and the height of the lower triangles is 
 
 
 
 . So the area of each of the upper triangles is 
 
 
 
 , and the area of each of the lower triangles is 
 
 
 
 . Since there are two upper triangles and two lower triangles, we get that the total area is 
A(x) = x
 
  36 − x2
 + 
  121 − x2
 
.



(b) How long should each of the two crosspieces be to maximize the area of the kite? (Round your answers to two decimal places.)
horizontal crosspiece       units
vertical crosspiece       units
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