An art critic whose eye level is 6 feet above the floor

Chapter 7, Problem 70

(choose chapter or problem)

An art critic whose eye level is 6 feet above the floor views a painting that is 10 feet in height and is mounted 4 feet above the floor, as shown in the figure. (a) If the critic is standing x feet from the wall, express the viewing angle in terms of x. (b) Use the addition formula for tangent to show that (c) For what value of x is ?

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