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内外弦图
Author:
Xuzhengming80970079
GeoGebra
New Resources
盈利與虧蝕
撒针估算面积实验
斐波那契螺旋弧线（表格法-可动态调节）
平行線的判定
常见四边形是否是双心四边形
Discover Resources
perimeter
tool1
Graph of Cosine
七巧板
a sin(bx+c) + d 的圖形的副本
Discover Topics
Translation
Differential Calculus
Numbers
Square
Polygons