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line joining centre to mid-pt. of chord ⊥ chord
Author:
Leo Chui
GeoGebra
New Resources
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
四邉形 (四年級) 教師版
第八周作业
GeoGebra笔记功能体验课件
Discover Resources
史坦納圓鍊 (Steiner Chain)
正弦定理
GGB1
Gradient of tangent
旋轉圓弧
Discover Topics
Scalene Triangles
Difference and Slope
Bar Chart or Bar Graph
Vectors
Scatter Plot