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Mathematics Tools :: Pinboard/geoboard : nrich.maths.org
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Mathematics Tools :: Pinboard/geoboard : nrich.maths.org
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http://nrich.maths.org/public/leg.php?code=5042
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Sitting Belt
Nine-pin Triangles Stage: ... Can you make a right-angled triangle on this peg-board by joining up ... What is the relationship between the angle at the centre ...
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