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直角三角形與正三角形
Author:
李春培
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
【案例】2013年安徽高考15题
拼砌四邊形
三位數除以一位數（二）
Discover Resources
Addition / Subtraction of 3 Directed Numbers
相似三角形
認識公里
正三角疊代
seven-eighths sphere 八分之七球面
Discover Topics
Trapezoid
Similarity Transformation or Similarity
Conditional Probability
Histogram
Constructions