直角三角形中夹着直角的两条边，都叫做直角边。
直角边直角三角形除斜边之外的两条边的任意一条。
大龙邮票1分银横双连无齿样票，带上右直角边，少见，上中品。
Large Dragons, 1ca, imperforate horizontal pair, with top right corner margins, rare, VF-F.
显然它就是当上帝意识到他需要另一个四边直角的图形来补足他初期的杰作正方形时想到的第一个矩形。
Palpably, it's the first rectangle that occurred to God when he realized he needed another four-sided, right-angled shape to complement his juvenile masterpiece, the square.
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