$\"\"$

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Observe the figure:

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One of the triangle side is $\"\"$ .

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The angle are $\"\"$ and $\"\"$ .

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Hence the angle $\"\"$ .

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Therefore $\"\"$ .

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In the triangle $\"\"$ , $\"\"$ .

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$\"\"$

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$\"\"$

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Law of sines: $\"\"$ .

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Consider $\"\"$ .

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Substitute $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Distance $\"\"$ ft.

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$\"\"$

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Distance $\"\"$ ft.