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同心圓+等分割線

Author:許清惟

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四邊形的特性
小数的副本
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
兩位數除以一位數（一）

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ANGLES
congruent (SS)
橢圓軌跡
謝爾冰司機-正方形
平行四边形个数

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