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综合（2）15.
Author:
Sylvie
GeoGebra
New Resources
兩組對邊相等的四邊形
小数 的副本
判斷球體
長方體平面投影 (Codex版)
Nested spiral octagon
Discover Resources
棋盤的 L 形覆蓋
斜拋模型
畢氏定理
圓柱截橫
z=g(x,y)函数图像
Discover Topics
Geometric Transformations
Secant Line or Secant
Percentages
Congruence
Arithmetic Operations