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交錯弓形圓周角

Author:+x sir

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【案例】2018年全国1卷理科12题
拼砌四邊形
兩組對邊相等和有直角的四邊形
畫出對稱圖形
画直线等分三角形的面积

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Billiard Ball
正n凸多邊形旋轉對稱／反射對稱
梯形堆垛
課堂工作紙(二)
數學電腦繪圖與解題

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Hypothesis Testing
Congruence
Mode
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