For a given fixed perimeter p, what will be the width of a Norman window in order to maximize its area?

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A Norman window is a rectangle with a semicircle on top. For a given fixed perimeter p, what will be the width of the window in order to maximize its area?

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Suppose width of the window is $w$

  • What is the radius of the semicircle?
  • What is the length of the curved part the semicircle?
  • What is the height of the rectangle in terms of $p$ and $w$?
  • What is the area of the window (the rectangle plus the semicircle) in terms of $p$ and $w$?
  • For given $p$, which $w$ maximises the area of the window?