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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,人教新课标四年级数学上册,角的分类和画角,直角,钝角,锐角,直角,锐角,钝角,平角,周角,直角,锐角,钝角,周角,平角,角的特征,直角是,90,0,锐角小于,90,0,钝角大于,90,而小于,180,0,0,角的特征,30,0,60,0,90,0,120,0,150,0,180,0,平角是,180,0,30,0,60,0,90,0,120,0,150,0,180,0,360,330,300,270,240,210,0,0,0,0,0,0,周角,360,0,角的特征,周角是()度,90,90,180,360,180,锐角()度,钝角大于()度,而小于()度,直角是()度,平角是()度,小于,90,2,个直角就是,1,(),3,个,45,度的角是()角,2,个,45,度的锐角是()角,1,个周角就是()个直角,2,个平角就是,1,个(),平角,周角,直,4,钝角,30,0,1=,2+,4,的和是多少?,3+,4,3,2,1,360,30 =330,0,0,0,30,0,0,90,0,60,三角板中的角度你知道吗?,是()角,,是()度。,120,钝,画出,60,度的角,
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