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内凹的四边形
Author:
李洋
GeoGebra
New Resources
平行線的判定
圓的基本性質
异形操场
龙形曲线-分形龙
第八周作业2
Discover Resources
Standard Deviation (one data set) 標準差（一組數據）
地科模型–日照長短
Trigonometric Identities
Copy of 劉徽的「割圓術」
Geogebra 入门
Discover Topics
Trigonometry
Plane Figures or Shapes
Symmetry
Derivative
Pythagoras or Pythagorean Theorem