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Similar triangles

Author:VCChung

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兩位數除以一位數（二）
多邊形的面積
【案例】2013年安徽高考15题
兩位數除以一位數（一）
垂直線的斜率

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七巧板（tangram）
Quiz on Angles in a Circle 圓內的角：測驗
Angle between a Line and a Plane
三角函數圖形
线段-视觉差

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Arithmetic Operations
Area
Histogram
Symmetry
Parallelogram

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