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Circumcentre

Author:Big Lee

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拼砌四邊形
第八周作业
找出對稱軸
兩位數除以一位數（二）
兩位數除以一位數（一）

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cos, sin 與單位圓
幾何鋪磚：正六邊形
不等式組-活動一
拼砌多邊形
anlge at centre twice angle at circumference

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Kite
Prism
Arithmetic Operations
Vectors
Vectors 2D (Two-Dimensional)

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