$\"\"$

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The surface area of a truncated cylinder is $\"\"$

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$\"\"$ (Divide each side by $\"\"$ )

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$\"\"$ (Cancel common terms) $\"\"$ )

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$\"\"$ \ \

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$\"\"$ (Subtract k from each side)

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$\"\"$ (Additive inverse property: $\"\"$ ) $\"\"$

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$\"\"$ (Substitute $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ $\"\"$

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The length h of a cylinder is $\"\"$

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