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到原點的距離為整數值的副本
Author:
风亦飞
,
sjfann
2013.03.20 複習考 第4題
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Nested spiral octagon
近似值：有效數字
長方體平面投影 (Codex版)
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畫出對稱圖形
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chap. 1 by ck
哈里斯螺旋 - 框線版 (Harriss Spiral)
Redefining Trigonometry by a Unit Circle
六邊形
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