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congruent (SS)
Author:
Ricky Chan
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（一）
拼砌四邊形
判斷球體
兩組對邊相等和有直角的四邊形
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題 1
第一冊
ggb-fs-a2
利用對摺找內心
數學傳播39卷4期, 平面幾何公式思考
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General Quadrilateral
Natural Numbers
Curve Sketching
Ratios
Frequency Distribution