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If the height of the tree is $\"\"$ , then if the angle is $\"\"$ .

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$\"\"$

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$\"\"$ .

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If the error in $\"\"$ is $\"\"$ and the error corresponding in $\"\"$ is $\"\"$ .

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$\"\"$

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If the percent error in $\"\"$ is $\"\"$ , $\"\"$ .

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Therefore,

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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$\"\"$

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The percentage error that can happen in angle is $\"\"$ .

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$\"\"$ .