Browsing by NSW K-10 Maths for the AC

proves triangles are similar, and uses formal geometric reasoning to establish properties of triangles and quadrilaterals

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Airplane infront of the moon
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Angle Chase
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Byrne’s Euclid
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How to measure a tree using a stick and some simple maths
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How to prove a mathematical theory - Scott Kennedy
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IWB Raw: Similar triangle diagrams
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NLVM Congruent Triangle Manipulative
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Pictorial Proofs of Euclid’s Elements
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The Brick Double-Domino Effect Explained
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