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三角形的内切圆与外接圆
Author:
夜雨嘀嗒
GeoGebra
New Resources
平行線的判定
圓的基本性質
科赫雪花
直線的斜率：水平變化 & 鉛垂變化
第八周作业1
Discover Resources
Multiplication of Polynomials 1(多項式的乘法 1)
三角比的性質
cos(α) + cos(β) + cos(γ) 的對稱性
学习几何
两角差的正切公式的证明
Discover Topics
Incircle or Inscribed Circle
Piecewise Functions
Constructions
Quadrilaterals
General Quadrilateral