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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
New Resources
近似值：有效數字
sanjiaohanshu
直角坐標平面上的旋轉變換
兩組對邊相等的四邊形
拼砌四邊形
Discover Resources
y=x²+a的圖形
趙庭浩的GGB電子書
Apollonius Problem 10 CCC wiki step 5
zentangle
直线与圆、圆与圆的位置关系
Discover Topics
Scalene Triangles
Linear Equations
Pythagoras or Pythagorean Theorem
Circumcircle or Circumscribed Circle
Arithmetic