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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
判斷球體
四邊形的特性
【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
Discover Resources
Sequence指令練習(一維)
畢氏定理變裝證明
Addition and Subtraction of Polynomials(多項式的加減法)
三角形的三线
Inclined plane (Angle between two planes)
Discover Topics
Real Numbers
Frequency Distribution
Mathematics
Intersection
Area