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三角形内角和
Author:
谢鹏
GeoGebra
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兩位數除以一位數（二）
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
找出對稱軸
拼砌四邊形
Discover Resources
Tedt
西姆松定理推廣(西姆松圓)
triangle
內外切圓性質
ANGLES
Discover Topics
Differential Calculus
Incircle or Inscribed Circle
Difference and Slope
Integral Calculus
Stochastic Process or Random Process