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三角函数：单位圆与函数图象
Author:
acchu
GeoGebra
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兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
兩位數加法
異分母分數減法
四邊形的特性
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P.4不規則圖形的周界
vector
How to draw a triangle with ruler and compasses?
躲掉1,-1,0的動態文字
全景平面投影
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Mathematics
Trigonometry
Plane Figures or Shapes
Quadratic Functions
Quadratic Equations