Mathalicious: Sofa Away From Me

How far away from the TV should you sit?

Your mother always told you not to sit too close to the TV. But sitting too far away from a small television is annoying because the picture looks too small. On the other hand, sitting very close to a large television is also not ideal because you can’t focus on the whole thing at once.

Given a television of a certain size, where’s the best place to put the couch? This lesson uses right triangle trigonometry and a rational function to explore the percent of your visual field that is occupied by the area of a television.


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Math Topics
Algebra & Pre-Algebra, Geometry
High School
9th Grade, 10th Grade, 11th Grade, 12th Grade

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