physics

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 90 m along the riverbank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is 50.0°. How wide is the river?

asked by Zoe
  1. Draw a right-triangle with an angle of 50° to the base which measures b=90 m.
    The height of the triangle is the width of the river, w.
    so w=b*tan(50°)

    posted by MathMate
  2. 45

    posted by l

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