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2018年秋七年级数学上册第4章4.3角4.3.3余角和补角（预习）课件（新版）新人教版.ppt

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第四章 几何图形初步,4.3 角,第四章 几何图形初步,4.3.3 余角和补角,4.3.3 余角和补角,探究新知,活动1 知识准备,25,4.3.3 余角和补角,活动2 教材导学,1在一副三角板中，每个三角板都有一个角是90，那么其余两个角的和是_ 2我们知道，若两数的和为0，则这两数互为相反数；若两数的积等于1，则这两数互为倒数那么当两角的和等于90或180时，该怎样表述它们的关系呢？,90,余角、补角,

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