A surveillance camera is mounted on a corner of a building. It rotates clockwise and counterclockwise continuously between Wall A and Wall B at a rate of 10° per minute.

a. What is the measure of the arc surveyed by the camera? 

b. How long does it take the camera to survey the entire area once? 

c. If the camera is at an angle of 85 from Wall B while rotating counterclockwise, how long will it take for the camera to return to that same position?

d. The camera is rotating counterclockwise and is 50° from Wall A. Find the location of the camera after 15 minutes.

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A B