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A surveyor measures the distance across a straight river by the following method: starting directly across from a tree on the opposite bank, she walks

A surveyor measures the distance across a straight river by the following method: starting directly across from a tree on the opposite bank, she walks 100 m along the riverbank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is 35.0°. How wide is the river?

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