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3 years ago

8

Please help! Numbers 4,7,9

1 answer:

Mazyrski [523]3 years ago

7 0

Answer:

what i think number 7 would be 5

Step-by-step explanation:

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Check the picture below.

$\bf \textit{total surface area of a cone}\\\\
SA=\pi r\sqrt{r^2+h^2}+\pi r^2~~
\begin{cases}
r=radius\\
h=height\\
-------\\
r=17\\
\sqrt{r^2+h^2}=12
\end{cases}
\\\\\\
SA=\pi (17)(12)+\pi (17)^2\implies SA=204\pi +289\pi \implies SA=493\pi$

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