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line joining centre to mid-pt. of chord ⊥ chord
Author:
Leo Chui
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
活动三：应用性质
盈利與虧蝕
第八周作业2
龙形曲线-分形龙2
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斜線圖 for x5
Proof1 彭凱揚
直線上的鄰角_1
合 24（附答案）
直纹面单叶
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Cube
Sequences and Series
Binomial Distribution
Histogram
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