$\"\"$

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From the given triangle $\"\"$

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$\"\"$

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

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$\"\"$ (Use calculator)

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$\"\"$ (Multiply each side by r)

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$\"\"$ (Cancel common term)

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$\"\"$ (Divide each side by 0.3090)

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$\"\"$ (Cancel common term)

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

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The length of $\"\"$ .