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How fast is viewing angle changing? A picture with a height of 3ft is placed on a wall with its base aft above an observers

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How fast is viewing angle changing?

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A picture with a height of 3ft is placed on a wall with its base aft above an observers eye level. The observer approaches the wall at Itt/sec. How fast is the viewing angle changing when observer is loft from the wall ? h 33+ + 90 A 10 ft from @ ift/ sec

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