角度的计算.ppt

,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,*,如图，回答下列问题,.,C,D,B,A,（,1,）,ABD,与,ABC,是同一个角吗？,（,2,）能用一个大写字母表示的角有几个？,（,3,）以点,A,为顶点的角有哪几个？,以点,D,为顶点的角呢？,（,4,）图中共有多少个角？是哪些角？,1,角度的计算,O,B,A,2,度,分,秒,60,60,3600,60,3600,60,(1),角的度量单位：,_,、,_,、,_.,度,分,秒,以度，分，秒为单位的角的度量制叫做,角度制,。,(2),度分秒的换算：,1=_,，,1=_.,60,60,3,注意：,角的度、分、秒是,60,进制,的，,这和计量时间的时、分、秒是一样的。,4,例,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,题型一：角度的换算,5,练习,(1),112.11,0,=_,_,解：（,1,）,112.11=112+0.1160,=112+6.6,=112+6+0.660,=112636,6,例,2,、把下列各题结果化成度,72,0,36,/,=_,0,37,0,14,/,24,/,=_,0,解,:(1)72,0,36,/,=72,0,+36,/,=72,0,+(3660),0,=72,0,+0.6,0,=72.6,0,7,(2)37,0,14,/,24,/,=37,0,+14,/,+24,/,=37,0,+14,/,+(2460),/,=37,0,+14,/,+0.4,/,=37,0,+14.4,/,=37,0,+(14.460),0,=37,0,+0.24,0,=37.24,0,8,练习,(2)5727=_,9,例,3,、加减法计算,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,/,题型二：角度的加减法运算,(1)12,0,36,/,56,/,+45,0,24,/,35,/,(2)79,0,45,/,61,0,48,/,49,/,10,(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,/,11,例,4,、乘除法运算,(3)21,0,31,/,27,/,3 (4)63,0,21,/,39,/,3,(5)106,0,6,/,25,/,5,解,:,原式,=(213),0,(313),/,(273),/,=63,0,93,/,81,/,=63,0,94,/,21,/,=64,0,34,/,21,/,题型三：角度的乘除法运算,12,(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,/,题型三：角度的乘除法运算,13,课堂练习,14,(1)52,0,49,/,12,/,+37,0,14,/,24,/,(2)82,0,-36,0,42,/,15,/,(3)35,0,36,/,47,/,9,(4)41,0,37,/,3,15,课后作业,三级跳,16,