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line joining centre to mid-pt. of chord ⊥ chord
Author:
Leo Chui
GeoGebra
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盈利與虧蝕
第八周作业1
直線的斜率：水平變化 & 鉛垂變化
第八周作业
龙形曲线-分形龙2
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部分佔全部的百分率: 例1
平行四邊形
ghk106a18 三角形的外心與正方形
Protractor-usage
圆锥曲线
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Trigonometric Functions
Geometric Distribution
Trapezoid
Similar Triangles
Function Graph