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Mathematics 7 Online
OpenStudy (anonymous):

A rain gutter is to be constructed by folding up the edges of a metal sheet. The metal sheet will be divided into thirds, so that one third is folded up on each side and one third is left in the middle. The width of the metal sheet is initially 30cm., so that each third will be 10 cm. wide. Find an expression for the cross-sectional area of the gutter in terms of theta.

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