Stage: 3 Challenge Level: 
How do you get from one vertex of a square to the next one?
How far across? How far up?
And to the next vertex? And to the next? And back to the start?
How far across? How far up?
And to the next vertex? And to the next? And back to the start?
Gradients. Graphs. Cartesian equations of lines. Linear functions. Area. Mathematical reasoning & proof. Perpendicular lines. Speed. Parallel lines. Tangent.
Published July 2009,August 2009.
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