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Introduction to Polar Coordinates 極坐標簡介
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
長方體平面投影 (Codex版)
近似值：有效數字
算柱 (兩位數)
球體建築師
找出對稱軸
Discover Resources
呼拉圈
DSE Circle-ACT01C Distance between Chords and Centre of a Circle
中垂線性質
交錯級數(Roger B. Nelsen)
三角函数的概念核心知识点