character: Eratosthenes
topic: Circle Measurement and Geometry
grade: 9
subject: Mathematics
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character: Archimedes
topic: Theorems on the Measurement of Circles
grade: 9
subject: Mathematics
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character: Pythagoras
topic: Geometry and Circle Properties
grade: 9
subject: Mathematics
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character: Euclid
topic: Elements of Circle Geometry
grade: 9
subject: Mathematics
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