Which formula is used to calculate the curved surface area of a cylinder-displaystyle pi - r - 2 -displaystyle 2pi rhdisplaystyle 2pi - r - 2 -displaystyle 2pi r

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Which formula is used to calculate the curved surface area of a cylinder?
$π r^{2}$
$2 π r h$
$2 π r^{2}$
$2 π r$

2 π r

π r^{2}

2 π r h

2 π r^{2}

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Which formula is used to calculate the curved surface area of a cylinder?
$π r^{2}$
$2 π r h$
$2 π r^{2}$
$2 π r$