Stage: 5 Challenge Level: 
A box of size $a$ cm by $b$ cm by $c$ cm is to be wrapped with a square shaped piece of wrapping paper. Cutting the paper is not allowed so what is the smallest square this sheet can be?
Now suppose we want to wrap up a cube, what is the smallest square of wrapping paper that can be used to minimise wastage?
Visualising. Inequality/inequalities. Stage 5 - Reviewed 2012. Mathematical reasoning & proof. Real world. Manipulating algebraic expressions/formulae. epsilons. alphas. Optimisation. Cuboids. Summation of series.
Published December 1999.
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