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縮放中心(四邊形)
Author:
葉宇笙
GeoGebra
New Resources
平行線的斜率
探究三角形的全等條件
多邊形的面積
第八周作业
球体的体积推导（优化版）
Discover Resources
angle sum of polygon
國旗
Copy of sin(x) 的函數圖形
正方形
连杆
Discover Topics
Special Points
Cuboid
Numbers
Statistics
Arithmetic Operations