yú jiǎo
意思解释：（Complement）某一不足90°的给定角或给定弧所不足那部分角或弧的值。
平面上两个角的和等于一个直角，这两个角就互为余角。1873年《代数术》卷十一:“凡角与正角(即直角，亦即方角)相较，谓之余角。”1885年狄考文译《形学备旨》上卷:“凡两角之和等于一直角，其两角即互为余角。”…
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