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鐘面的時間（時和分）
Author:
Anthony OR 柯志明
GeoGebra
New Resources
立体几何-公理3及推论
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Hypocycloids
apec
Special Right Triangles 30°-60°-90° and 45°-45°-90°
Discover Resources
simple_hyperbola
conics
angles in circle1
dalton puzzle cube
My creation
Discover Topics
Ratios
Secant Line or Secant
Logarithm
Logic
Special Points