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Reference Angle 參考角
Author:
Alex CHIK
Topic:
Trigonometry
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
錐體建築師
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
四邊形的特性
【案例】2013年安徽高考15题
Discover Resources
試證明：A=B+C
ghseh 二次函數的開口方向
圓內一點
拋物線1-焦點法
圓錐曲線Conic Section
Discover Topics
Statistical Characteristics
Parabola
Arithmetic
Pythagoras or Pythagorean Theorem
Incircle or Inscribed Circle