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PMC 2012-13 Q7
Author:
Arthur Lee
題目七
圖中有一個邊長5cm的正十二邊形，當中包含十二個等邊三角形。把藍點移向最左，讓中心的六個三角形重新排列後，便會出現一個綠色十二角星。求該星狀圖形的面積。
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