The total surface area of a solid right circular cylinder is \( 231 \mathrm{~cm}^{2} \). If curv...

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The total surface area of a solid right circular cylinder is \( 231 \mathrm{~cm}^{2} \). If curved surface area is \( 2 / 3 r d \) of the total surface area, then determine the radius of its base.
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