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Final answer:

The width of the river across a canyon can be calculated using trigonometry and surveyor's measurements.


Explanation:

The width of the river can be calculated using trigonometry based on the surveyor's measurements.

By using the angle and the distance walked along the river as a baseline, the width of the river can be determined.

In this case, the width of the river would be approximately 117 feet.


Learn more about calculating width of a river using trigonometry here:

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