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Equation for the surface area of a cylinder open at both ends?

So for a normal closed cylinder its 2pir^2+2pirh, so if its open at both ends do you take away one of the pir^2 or both?
Original post by mc_graham
So for a normal closed cylinder its 2pir^2+2pirh, so if its open at both ends do you take away one of the pir^2 or both?

both. its circumference x height
both... the ends are open ?

just 2πrh
Reply 3
Remember to add the area of the inside!

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