Stage: 4 Challenge Level: 
What happens to the area of a triangle if I keep the height the
same but double the base? Or treble it? Or...?
Mathematical reasoning & proof. Number theory. Inequality/inequalities. smartphone. chemistry. Area. Calculating with ratio & proportion. Manipulating algebraic expressions/formulae. Dynamical systems. Stage 5 - Reviewed 2012.
Published April 2000,February 2010.
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