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黎曼和
Author:
Hsuan
GeoGebra
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圓的切線方程
直線的斜率：水平變化 & 鉛垂變化
圓的基本性質
中华人民共和国国旗
撒针估算面积实验
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三角形外角和為360度
Equal chords cut off equal arcs in a circle
正五角錐(旋轉，實體、透視)
Test
Lesson02 absolute value function
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Expected Value
Complex Numbers
Isosceles Triangles
Polygons
Rhombus