Maths

A person stands in front of a cylindrical water tank and has a viewing angle of 27 degrees to the sides of the tank. What percentage of the circumference of the tank can they see?

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asked by Henry
  1. The central angle subtended by the visible arc is
    2*(90-27/2) = 153°
    so, they can see 153/360 = 42.5%

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    posted by Steve

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