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Chords equidistant from centre are equal
Author:
Leo Chui
GeoGebra
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第八周作业3
第八周作业2
三角函数 的副本
圓的基本性質
直線的斜率：水平變化 & 鉛垂變化
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動圓的圓心軌跡為橢圓
Angle between Two Planes 面面角
gjh-g01-00 單項乘以兩項和
垂心應用
比例中的定值問題
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Orthocenter
Parametric Curves
Trigonometric Functions
Square
Quadrilaterals