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一线三等角的相似模型

Author:陈丽婷

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兩組對邊相等的四邊形
錐體建築師
找出對稱軸
四邊形的特性
兩組對邊相等和有直角的四邊形

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畫三角形題3b
垂心的動畫
cycloid
轴对称的两点的动画演示.许兴华数学
加减乘除运算出题器

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Unit Circle
Area
Continuity
Planes
Tree Diagrams

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