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GeoGebra
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画直线等分三角形的面积
【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
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整數÷整數_ 工作紙（一）_題8
Surface area of sphere
Trigonometric Ratios of Special Angles 特殊角的三角比
Locus of a vertex of equilateral triangle
數學傳播39卷4期, 平面幾何公式思考
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Ratios
Parallelogram
Orthocenter
Geometric Distribution
Fractal Geometry