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line joining centre to mid-pt. of chord ⊥ chord
Author:
Leo Chui
GeoGebra
New Resources
判斷球體
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
錐體建築師
兩位數除以一位數（二）
Discover Resources
相切的三圓
Math_Class Activity 1
軌跡觀察---三同心圓上的三角形重心軌跡
二次函數的圖形-平移版
兩個骰子的點數和的副本
Discover Topics
Vectors
Straight Lines
Circumcircle or Circumscribed Circle
Integers
Upper and Lower Sum or Riemann Sum