character: Euclid
topic: Fundamental Circle Theorems
grade: 9
subject: Mathematics
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character: Archimedes
topic: Properties of Circles
grade: 9
subject: Mathematics
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character: Ptolemy
topic: Ptolemy's Theorem and Circles
grade: 9
subject: Mathematics
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character: Thales
topic: Thales' Theorem related to Circles
grade: 9
subject: Mathematics
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