三角形三條邊都知道了,形狀確定了,面積肯定是能算出來的。而且隱隱約約覺得有那麼個具對稱美的公式。但怎麼也想不起來了。也許重來就沒有親手推導過。是的,“美”是必須的,正如英國數學家Hardy所說。 The mathematician’s patterns, like the painter’s or the poet’s, must be beautiful; the ideas, like the colours or the words, must fit together in a harmonious way. Beauty is the first test: there is no permanent place in the world for ugly mathematics. G. H. Hardy 那就不妨補補課。忙乎一陣子,得到 (1/4)√((b + c + a)(b + c - a)(a + c - b)(a + b - c)) 感覺不錯,夠漂亮的了。找谷歌對對答案,才發現美無止境啊。 √(S(S - a)(S - b)(S - c)) |