"A trough is to be made by bending a long rectangular piece of tin 3

feet wide. The cross-section of the trough is an isosceles trapezoid

with sides making angles of 120 degrees with the base. Find the

dimension of the cross-section which gives a maximum capacity"

The questions states that the base is 1ft, the top is 2ft and the height is √3/2ft

Thank you!

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