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2 years ago

15

Plz help me an expert help me

1 answer:

Airida [17]2 years ago

5 0

Answer:

im no expert but the answer is 10

Step-by-step explanation:

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What is the best approximation of the surface area of this right cone?

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$\bf \textit{total surface area of a cone}\\\\
s=\pi r\sqrt{r^2+h^2}+\pi r^2\quad 
\begin{cases}
r=radius\\
h=height\\
-----\\
r=12\\
h=9
\end{cases}
\\\\\\
s=\pi (12)\sqrt{12^2+9^2}+\pi (12^2)\implies s=12\pi \sqrt{225}+144\pi 
\\\\\\
s=12\pi (15)+144\pi \implies s=180\pi +144\pi \implies s=324\pi$

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Step-by-step explanation:

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