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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
Nested spiral octagon
畫出對稱圖形
四邊形的特性
兩組對邊相等的四邊形
判斷球體
Discover Resources
过定点且与直线相切的圆
glt-c02-11 七角柱旋轉
正六角錐(旋轉，實體、透視)
垂心
EnergyMath 2-3 棣美弗定理的副本
Discover Topics
Reflection
Derivative
Cone
Geometric Mean
Diagrams