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20. (a) What is the viewing angle for the tunnel 21. sign in Fig. 24? (b) Use arctangents to describe the viewing angle when the

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20. (a) What is the viewing angle for the tunnel 21. sign in Fig. 24? (b) Use arctangents to describe the viewing angle when the observer is x feet from the entrance of the tunnel. (a) What is the viewing angle for the chalk board in Fig. 25 ? (b) Use arctangents to describe the viewing angle when the student is x feet from the front wall. Fig. 24: On the road

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