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尺规作图：过一点作已知直线的垂线
Author:
杜灵增
尺规作图：过一点作已知直线的垂线
GeoGebra
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探究三角形的全等條件
平行線的斜率
圓周公式的應用
常见四边形是否是双心四边形
龙形曲线-分形龙
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曲柄滑塊模擬
Combined Quiz on Bearings 方位：合併測驗
梯形旋轉
平移
P.4 對稱
Discover Topics
Binomial Distribution
Parabola
Rotation
Tree Diagrams
Median Value