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判斷球體（欖球）
Author:
Martin Fong
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Slope field plotter
cones_001
Balance
Diameter and Circumference of a Circle
Infinite Geometric Series
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Circle - Hale
Circle arc
Farrell_Megan_task02GeoGebra
Lingye WU
Darts
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Right Triangles
Standard Deviation
Logic
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Angles