3 years ago

Sally gave 2 cookies to Fred

Mathematics

1 answer:

defon3 years ago

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Rhbebrbrbyvbthehjahwhgwvwcevheve engrb sally ate 3 cookie

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If the radius of the circle is multiplied by a factor of 3, then the area of the circle is multiplied by a factor of

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$\bf \textit{area of a circle}\\\\
A=\pi r^2\quad 
\begin{cases}
r=radius\\
-----\\
r=\stackrel{r\times 3}{3r}
\end{cases}\implies A=\pi (3r)^2
\\\\\\
A=\pi (3^2r^2)\implies A=9(\pi r^2)$

notice, if the original area was πr², then the new area has a factor in front of it, that much.

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