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折正三角形
Author:
cherry910502
GeoGebra
New Resources
拼砌四邊形
球體建築師
球体的体积推导（优化版）
四邊形的特性
兩組對邊相等和有直角的四邊形
Discover Resources
Rotational Symmetry - Octahedron
生活中的平面圖形─多邊形的性質
transformation_reflection
疊代三角形
拼出三角形的副本
Discover Topics
Differential Equation
Pythagoras or Pythagorean Theorem
Ratios
Indefinite Integral
Cylinder