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congruent triangles_provided by Mr Yeung Kar Chun
Author:
kidmancmw
GeoGebra
New Resources
四邊形的特性
近似值：有效數字
世界平面地圖 (Codex╱2026.10.07)
Nested spiral octagon
美國國旗 (Codex, 2026.10.06)
Discover Resources
面積分點公式
三角形的內心
三角形內角和
Locus (Two points 1)
兩位數除以一位數（二）
Discover Topics
Correlation
Pythagoras or Pythagorean Theorem
Planes
Perimeter
Trapezoid