Sandy cut out 2 squares and 7 circles from a piece of cardboard. The length of the sides of each square was x inches and radius of each circle was y inches. The expression below shows how many more square inches of cardboard Sandy used for making the circles than the squares:

7πy2 - 2x2

What does the term 7πy2 in the expression represent?

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22-01-2015
Mathematics

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Sandy cut out 2 squares and 7 circles from a piece of cardboard. The length of the sides of each square was x inches and radius of each circle was y inches. The expression below shows how many more square inches of cardboard Sandy used for making the circles than the squares:

7πy2 - 2x2

What does the term 7πy2 in the expression represent?

Sagot :

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Анонимidn Анонимidn · Answer 1 · 2015-01-26T14:32:53-05:00

Анонимidn Анонимidn

26-01-2015

[tex]7\pi y^2\ represent\ the\ area\ of\ 7\ circles.\\\\Area\ of\ the\ circle:A_O=\pi r^2\ where\ r\ is\ a\ radius\ of\ the\ circle.\\\\In\ your\ example\ r=y\ therefore\ area\ of\ the\ one\ circle\ is\ equal:\\\\A_O=\pi y^2\\\\area\ of\ the\ 7\ circles\ is\ equal\ 7A_O=7\pi y^2[/tex]

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Sagot :

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