Solve the problem.A boat is sailing directly toward a lighthouse that is 90 ft tall. The angular size ? of the lighthouse is the angle formed by the lines from the top and bottom of the lighthouse to the observer on the boat, as shown in the figure. What is the rate of change of the angular size d?/dx when the boat is 300 feet from the lighthouse?
A. -0.00010 rad/ft
B. 0.00526 rad/ft
C. -0.00917 rad/ft
D. -0.00092 rad/ft
Answer: D
Mathematics
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