Fifteen lessons that turn the coordinate plane into a place where geometry can be argued rather than only drawn. The Core work found midpoints, gradients and distances by counting squares; this area turns each of those processes into a formula, then spends the rest of its time on what formulas make possible: equations of lines, proofs about figures, symmetry, and the four transformations.
This is a Path focus area, sitting outside the Core and preparing you for Mathematics Advanced in Year 11. Almost none of it is ever retired. The three formulas and the equation forms are used in every senior coordinate geometry question, and the habit built here, of naming the property that justifies a conclusion rather than only computing, is what senior proof questions are marked on.
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