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A circular disk radius r is cut out from square of a cardboard. Express the area of wasted materials as a function of radius.

Sagot :

let x = radius of circle

therefore 2x = length of side of square

TTX²

Area of circle

Area of square

= 2x.2x = 4x²

Area of wasted part = 4x²-x²

the function is f(x)

4x² - TTX²

=