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相切圓之圓半徑
Author:
曾慧敏
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
盈利與虧蝕
常见四边形是否是双心四边形
科赫雪花
双心四边形
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Addition and Subtraction of Directed Numbers (2) 有向數加減(2)
棒形圖3
Rotational and reflectional symmetry of a regular polygon
中位线的副本
梯形
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Cosine
Line Segment
Statistics
Angles
Subtraction