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Question

Sal and his friend are on opposite sides of a river. To find the width of the river, each of them hammers a stake on his bank of the river in such a way that the distance between the two stakes approximates the width of the river. Sal walks 10 feet away from his stake along the river and finds that the line of sight from his new position to his friend’s stake across the river and the line of sight to his own stake form a 73°34′ angle. How wide is the river?

Answer 1

Always draw the problem. Once you establish a right triangle 73+ degrees with the distance across the river opposite the angle, you can work out that distance:

opp/adj = tanθ where theta is the angle and adjacent is 10 feet.