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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
異分母分數減法
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
球体的体积推导（优化版）
Discover Resources
Golden Spiral
正方體一筆畫
小阿樂
體積
Copy of 銳角三角：sin, cos
Discover Topics
Terms
Solids or 3D Shapes
Scalene Triangles
Bar Chart or Bar Graph
Percentages