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Concept · 4 steps · NESA MA4-ARE-C-01

Area of a Triangle

The full climb — from why the formula is true, all the way to using it on real shapes and running it backwards. Four short steps, each with its own toy to play with.

1 Where it comes fromSee why a triangle is half a rectangle. Drag and fold the proof. 2 How to do itThe three-move method, with a practice generator to lock it in. 3 Where it gets trickyObtuse triangles, escaping heights, and choosing the base. 4 Out in the wildComposite shapes, real problems, and working backwards.
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