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Coffee Gold Cup
Author:
Chenwei Chen
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半圆的滚动
繪畫梯形
勒洛四面体（拼接法）
在釘點紙上畫三角形
繪畫長方形
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商高定理之新月形
共頂點、底共線
斜拋模型
Question 2
多邊形周界A
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Triangles
Trigonometry
Integral Calculus
Upper and Lower Sum or Riemann Sum
Conic Sections