I have absolutely no idea how to do this or even start it
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Let k be the amount of light admitted per unit area of glass.
The total amount of light admitted by the whole window is:
But the perimeter is
Now, differentiate wrt r, set to 0 and solve for r.
sry what does L mean and isnt the rectangle area equal lw not rh?
L stands for Light. I believe he used r because the length of the rectangle is 2*radius of the semicircle. h is just the height of the rectangle.
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