46.A window is in the form of a rectangle surrounded by a semicircular opening. The total perimeter of the window is 100m. Find the dimensions of the window so as to admit maximum light through the whole opening.
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Step-by-step explanation:
We use the formula of 2(l+b) here.
Since it's surounded by semicircular opening then let the length and breadth be equal, since they both are surrounded by a semicircular opening.
so 2(l+l)=100
=)4l=100
=)l=25
so length and breadth being equal is 25 cm.
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