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我用了另一方法來証,就是用面積。
Area_{ABP} + Area_{BCP} + Area_{CAP} = Area_{ABC}
(AB x + BC z + CA y) / 2 = Area_{ABC}
因為是等邊三角形
BC (x + z + y) = 2 Area_{ABC}
x + y + z = 高
Nick work :D
這招利用三角形面積的做法,我經常也會遺漏,很多時也能大大減省步驟呢。
還有一招我經常遺忘的做法,就是三角形同高同底的特性!也是一招勁野,哈哈哈。
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