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三角形的旁心
Author:
Ben James(yahoo)
GeoGebra
New Resources
斜率的值
【案例】2018年全国1卷理科12题
漂亮的摇摆曲线
圓的切線方程
【案例】圆柱体内放置一个大球六个小球
Discover Resources
畢氏定理
畢氏定理動態證明(歐基里得，平形四邊形等面積，應用polyline)
trapezoid2
Orthocentre
三角形内角和
Discover Topics
Ratios
Kite
Hyperbola
Scatter Plot
Logarithmic Functions