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congruent (SSS) 2
Author:
Ricky Chan
GeoGebra
New Resources
Fibonacci Clock
近似值：有效數字
算柱 (兩位數)
第八周作业
兩組對邊相等的四邊形
Discover Resources
Function3
謝爾賓斯三角形
學習單：平行四邊形面積
三角形相似的直观显示.许兴华数学
诱导公式三（x轴对称关系）
Discover Topics
Tree Diagrams
Natural Numbers
Logarithmic Functions
Secant Line or Secant
Vectors 2D (Two-Dimensional)