人教版七年级上册4.3.3角度的换算

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,*,*,*,角度的换算,自己动手，一定能行！,1、分别画出30,0,，45,0,，60,0,，90,0,的角；,2、你能画出15,0,，75,0,，105,0,，120,0,，135,0,、150,0,和165,0,的角吗？画一画。,一,周角=,2,平角=,4,直角=360,0,一,平角=180,0,一,直角=90,0,1,0,=60,/,1,/,=60,/,（读成1度等于60分，1分等于60秒 ）,请你要牢记哟!,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,例题3 计算,(1) 12,0,36,/,56,/,+ 45,0,24,/,35,/,解:(1)原式=(12+45),0,+(36+24),/,+(56+35),/,=57,0,+60,/,+91,/,=57,0,+61,/,+31,/,=58,0,+1,/,+31,/,=58,0,1,/,31,/,(2) 79,0,45,/, 61,0,48,/,49,/,解:原式=79,0,44,/,60,/, 61,0,48,/,49,/,=78,0,104,/,60,/, 61,0,48,/,49,/,=(78 -61),0,(104 -48),/,(60-49),/,=17,0,56,/,11,/,(3)21,0,31,/,27,/,3,解:原式=(213,),0,(313),/,(273),/,=63,0,93,/,81,/,=63,0,94,/,21,/,=64,0,34,/,21,/,(4) 63,0,21,/,39,/,3,解:原式=(633),0,(213),/,(393),/,=21,0,7,/,13,/,(5)106,0,6,/,25,/,5,解:原式=(1065),0,(65),/,(255),/,=21,0,(,66,5),/,(255),/,=21,0,13,/,(,85,5),/,=21,0,13,/,17,/,今天你学到了些什么?,和你同伴交流一下!,