互为余角和互为补角是初中几何第一章第二单元的两个重要概念。学习这部分内容时，一要理解和掌握有关概念，二要掌握余角和补角的计算方法．一、概念辨析1．“互余”和“互补”是对两个角而言的，是关于两个角的数量关系的概念：若，则与互为余角；反之，若1与2互为余角，则． Complementing each other and complementing each other are two important concepts in the second unit of the first chapter of junior high school geometry. When learning this part of the content, we must first understand and master the concepts, and secondly, we must master the calculation methods for the redundant and complementary angles. First, the concept of analysis 1. “Complementary” and “complementary” are the concepts of the relationship between the two angles in terms of two angles: if they are, then they are mutually redundant; if, on the other hand, 1 and 2 are complementary angles, then