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circle: line from centre
Author:
Ng Ching Yi
GeoGebra
New Resources
Fibonacci Clock
兩組對邊相等的四邊形
拼砌四邊形
四邊形的特性
四邉形 (四年級) 教師版
Discover Resources
equation of circle
直角
一般變換的副本
圓周角與圓心角之度數關係臆測（圓心在圓周角的內部）
双心四边形
Discover Topics
Fractal Geometry
Rhombus
Optimization Problems
Mathematics
Polynomial Functions