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Homework Statement
A Norman window has the shape of a rectangle with a semicircular top. Assume that the semicircular portion of the peripmeter is three times as costly to build per metre as the straight edges. For a given area, what ratio of heigh to radius would minimize the cost.
Homework Equations
A diagram. r is radius, h is height.
The Attempt at a Solution
[tex]P = (\pi r)+ 2r+ h + h[/tex]
I'm not sure if this is right. It is asking for area so I should use [tex] S.A = (\pi r^2)/2 + 2rh[/tex]?
I'm just having trouble setting up the equation.
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