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圆心可变的扇形在x轴上滚动
Author:
赵林
GeoGebra
New Resources
拼砌四邊形
三位數除以一位數（一）
四邉形 (四年級) 教師版
算柱 (兩位數)
三位數除以一位數（二）
Discover Resources
垂心即內心
圓繞圓
Rectangle _03
Name the prism 3
學習活動二解的圖形
Discover Topics
Orthocenter
Arithmetic
Binomial Distribution
Vectors
Cone