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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
長方形兩條對角線的交角為60度
Jun 19th 2013, 05:00

對角60度.上面夾角120度.下面夾角120度

長方形其對角線等長

兩邊三角形一樣只要看一邊

看右下角三角形為30度60度90度

依據30:60:90=1:√ 3:2

設對角線長為2k,短邊長為k

==>2k+k=10
==>k=10/3

對角線長為2k=2*(10/3)=20/3

選(D) 

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