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congruent (SSS) 2
Author:
Ricky Chan
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
找出對稱軸
三位數除以一位數（二）
兩位數除以一位數（一）
判斷球體
Discover Resources
正弦定理
Locus (Segment)
Ex.2
加法有圖案
变化的三角形的垂心.许兴华数学
Discover Topics
LCM and GCD
Frequency Distribution
Upper and Lower Sum or Riemann Sum
Differential Calculus
Isosceles Triangles