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角的度量,西南师大版四年级数学,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,角,顶点,边,边,0,4 厘米,3厘米,4 厘米,12 平方厘米,0,中心点,量角器,0刻度线,0刻度线,0,0,1度,1,0,10,20,30,40,180,170,160,150,140,130,120,110,100,90,80,70,60,50,0,10,20,30,40,180,170,160,150,140,130,120,110,100,90,80,70,60,50,50,0刻度线,中心点,0,10,20,30,40,50,130,0刻度线,中心点,80,84,63,67,67,42,8,