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angle between lines
Author:
johnmayhk
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
第八周作业
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
Discover Resources
旋轉對稱
正三角形堆垛
劉徽的「割圓術」
二面角的副本
高中数学-复数-自测、自练实验
Discover Topics
Differential Equation
Stochastic Process or Random Process
Ellipse
Volume
Poisson Distribution