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line joining centre to mid-pt. of chord ⊥ chord
Author:
Leo Chui
GeoGebra
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椭圆内切圆链
斐波那契螺旋弧线(表格法)
平行線的判定
异形操场
折扣
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模版 - 有框黑板 (1)
判斷錐體 2
M05E Rate of Change
三圓外切
二倍角的余弦公式的证明
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Sequences and Series
Straight Lines
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Geometric Distribution