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四邊形內部反射_長寬角度可調整
Author:
boooooooyu
GeoGebra
New Resources
四邊形的特性
找出對稱軸
兩組對邊相等和有直角的四邊形
判斷球體
兩位數除以一位數（一）
Discover Resources
固定三角形的條件−題3
String Art
example
量度身高
双动点变速运动
Discover Topics
Right Triangles
Volume
Straight Lines
Tree Diagrams
Ratios