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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,*,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,*,4.4.2,角的度量单位,度 分 秒,2012,、,12,、,28,把一个周角360等分,每一份就是,1度的角,,记作,1,;,把1度的角60等分,每一份叫做,1分的角,,记作,1,;,把1分的角60等分,每一份叫做,1秒的角,,记作,1,。,角是以,度,分,秒,为单位的。,1,度,=60,分,1,分,=60,秒,1,秒,=,分,1,分,=,度,1,60,60,1,例,1,:用度分秒表示,30.26,例,2,:用度表示:,42,18,15,2、用度表示:,3936,16,14,24,39.6,练习:1、用度、分、秒表示:,16.24,例题,1,填空,(,1,),34.5,0,=,0,/,(,2,),112.27,0,=,0,/,/,解:(,1,),34.5,0,=34,0,+0.5,0,=34,0,+0.5,60,/,=34,0,+3 0,/,=34,0,30,/,(,2,),112.27,0,=112,0,+0.2760,/,=112,0,+16.2,/,=112,0,+16,/,+0.260,/,=112,0,16,/,12,/,34,30,112,16,12,1,0,=60,/,1,/=,60,/,例题2 把下列各题结果化成度,72,0,36,/,(2)37,0,14,/,24,/,解:(1)72,0,36,/,=72,0,+36,/,=72,0,+(3660),0,=72,0,+0.6,0,=72.6,0,(2)37,0,14,/,24,/,=37,0,+14,/,+24,/,=37,0,+14,/,+(24,60),/,=37,0,+14,/,+0.4,/,=37,0,+14.4,/,=37,0,+(14.460),0,=37,0,+0.24,0,=37.24,0,例,2,把一个周角,17,等分,每份是多少?(精确到,1,),解,36017=21+317,=21+,180 1,7,2111,做一做,你做对了吗?,讨论,3 15,与,3.15,相等吗?,东,南,西,北,方位角,
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