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時鐘（教師用）
Author:
Steve Tsang
可顯示或隱藏分針，讓學生觀察時針的運動。
New Resources
交集
绕原点旋转的正方体
Cursive u
Cursive i
Cursive h
Discover Resources
Demo TangentPoint Bug
凹透鏡 Concave Lens
Approximating Derivative Functions
Rosace_8_branches_carrés
Curve
Discover Topics
Division
Geometric Transformations
Statistics
Numbers
Median Line