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長方形
Author:
Yin Kelvin Wong
GeoGebra
New Resources
柱體建築師
球體建築師
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
兩組對邊相等的四邊形
Discover Resources
橢圓軌跡 (4)
精神堡壘
弦心距比較
IMO2014C
ctr to mid perd
Discover Topics
Median Line
Similarity Transformation or Similarity
Differential Equation
Statistics
Secant Line or Secant