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8-8-1三角形的心(4心)
Author:
pingfeng.wu
GeoGebra
New Resources
判斷球體
找出對稱軸
兩組對邊相等和有直角的四邊形
拼砌四邊形
四邉形 (四年級) 教師版
Discover Resources
證明
四塊面積
固定周界長方形的面積變化（三）
中位线问题
多邊形的面積
Discover Topics
Derivative
Median Value
Pie Chart or Circle Chart
Differential Calculus
Cylinder