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congruent (SA)

Author:Ricky Chan

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異分母分數減法
画直线等分三角形的面积
拼砌四邊形
判斷球體
三位數除以一位數（二）

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三角形數
P53_3c
sweet sugar
勾股定理：射影无字证明
正三角形在长方形边上移动加滚动

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Orthocenter
Reflection
LCM and GCD
Upper and Lower Sum or Riemann Sum
Real Numbers

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