Stage: 4 Challenge Level: 
A plastic gutter is designed to catch water at the edge of a roof.
Manufacturers need to minimise the amount of material used to make their product. What is the best cross-section for a gutter?
Similarity. alphas. Manipulating algebraic expressions/formulae. Perimeters. smartphone. Optimisation. Area. Creating expressions/formulae. Inscribed circle. Mathematical reasoning & proof.
Published July 2007,August 2007.
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