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鐘面的時間（時和分）
Author:
Anthony OR 柯志明
GeoGebra
New Resources
רישום חופשי
Visualizing the Pythagorean Identity with Sine and Cosine
GGB is Awesome!
Tetrahedron String Art
Average Value
Discover Resources
Quadratic Vertex Form Slider Tool
Exploring Graphical Transformations
Résolution
The Unit Circle and the Primary Trigonometric Functions
ball
Exploring Circles in the Coordinate Plane
Discover Topics
Straight Lines
Integers
Sphere
Symmetry
Parabola