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graph of tangent function
Author:
CheungYT
GeoGebra
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撒针估算面积实验
双心四边形
折扣
异形操场
平行線的判定
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畢氏定理
生活中的平面圖形關係─平分
Cycloid
拋物線四-平行四邊形法
C60足球模型（弧线）
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Pyramid
Parallelogram
Histogram
Parabola
Symmetry