?A rain gutter is to be constructed from a metal sheet of width 30 cm by bending up
Chapter 4, Problem 82(choose chapter or problem)
A rain gutter is to be constructed from a metal sheet of width 30 cm by bending up one-third of the sheet on each side through an angle 𝛳. How should 𝛳 be chosen so that the gutter will carry the maximum amount of water?
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