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What is the distance OP you should stand that maximizes the viewing angle APB?

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A picture measuring 14 units hangs on a wall 18 units above your eyesight. The wall is perpendicular to the floor. At what distance should you stand so you have the maximum viewing angle between the top and bottom of the painting?
Geometrically, make a line ABO and a perpendicular OP, with the painting AB = 14 hanging above the wall with BO = 18.
What is the distance OP you should stand that maximizes the viewing angle APB?
enter image description here

posted Aug 10, 2023 by Pushpak Chauhan

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