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⊥ bisector of chord passes through centre
Author:
Leo Chui
GeoGebra
New Resources
第八周作业
算柱 (兩位數)
sanjiaohanshu
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
Discover Resources
奈格爾點
正多邊形各邊中點連線所圍成的圖形
Tangent properties
圓外冪性質
相反数 思考（教材第10页）
Discover Topics
Pythagoras or Pythagorean Theorem
Circumcircle or Circumscribed Circle
Vectors
Subtraction
Logic