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最小周長
Author:
張丰耘
GeoGebra
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判斷球體
兩組對邊相等和有直角的四邊形
近似值：有效數字
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
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相似三角形例題
圓內接四邊形 ABCD ...，求 sinθ=?
勝敗機率
单位圆画三角函数图像
圓外冪性質
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Parametric Curves
Ellipse
Trigonometric Functions
Logic
Conditional Probability