$\"\"$ $\"\"$ $\"\"$

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

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According to divison property of equality: Divide each side by $\"\"$ .

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$\"\"$

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$\"\"$ (Cancel common terms)

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According to subtraction property of equality: Subtract k from each side.

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$\"\"$

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$\"\"$ (Apply 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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