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# Help

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Use the net to find the surface of the cylinder Length 7 cm Width 9 cm

Guest Apr 25, 2017
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Use the net to find the surface of the cylinder Length 7 cm Width 9 cm

I do not use a net and use this formula:

$$A=\frac{1}{2}\pi w^2+\pi w l=\pi w(\frac{w}{2}+l)$$

$$A=\pi\cdot 9cm(\frac{9cm}{2}+7cm)=\pi \cdot103.5\ cm^2$$

$$A=325.155\ cm^2$$

$$The \ surface \ of \ the \ cylinder \ is \ 325.155\ cm^2.$$

!

asinus  Apr 26, 2017

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