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哥倫布和麥哲倫以自己的生命為代價,證明了地球是圓形的。但在2000年前,艾拉托斯尼就已經發現地球是圓的,還計算出地球的大小。他如何做到呢?古希臘大數學家丟番圖用這樣的形式留下了他的簡歷自傳。這塊碑文,真實地記載了他生命中的重大問題。你能根據墓碑上的數學題將數學家的年齡、家庭經歷一一推算出來嗎?方圓很好理解,是幾何圖形,那麼你知道規矩是什麼嗎?