character: Archimedes
topic: Properties of Circles
grade: 9
subject: Mathematics
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character: Euclid
topic: Geometric Properties of Circles
grade: 9
subject: Mathematics
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character: Eratosthenes
topic: Circle Measurement and Geometry
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Circle Theorems and Applications
grade: 9
subject: Mathematics
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