character: Euclid
topic: Basic Properties of Circles
grade: 9
subject: Mathematics
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character: Archimedes
topic: Circle Theorems and Measurements
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Properties of Circles and Cyclic Quadrilaterals
grade: 9
subject: Mathematics
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character: Descartes
topic: Geometry of Circles and Solving Equations
grade: 9
subject: Mathematics
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