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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
四邉形 (四年級) 教師版
畫出對稱圖形
近似值：有效數字
兩組對邊相等和有直角的四邊形
小数 的副本
Discover Resources
立體錯覺樓梯(使用透視法會稍有差距)
彈幕模擬
四邊形ADFE的面積是多少？
剪紙問題
S3 Ex4.3 Q01(3D圖)
Discover Topics
Addition
Right Triangles
Geometric Distribution
General Quadrilateral
Probability