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如图:,AOC,是哪两个角的和,?BOD,是哪 两 角的差,?,如果,AOB=COD,那么,AOC,和,BOD,相等吗,?,D,O,C,B,A,(,1,),AOC=AOB,BOC,(,2,),BOD=AOD,AOB,(,3,),AOC=AOB,BOC,,,BOD=BOC,COD,AOB=COD BOC=,BOC,AOC=BOD,解,:,练一练,1,=(),,,1=(),;,1=,(),,,1=,(),.,例,1,将,57.32,用度、分、秒表示,.,解:,0.32,=60,0.32=19.2,(,先把,0.32,化为分,),0.2=60,0.2=12,(,再把,0.2,化为秒,),57.32=57,1912,60,60,例,2,把,10,636,用度表示,.,解:,36=,(),36=0.6,6+0.6=6.6,6.6=,(,),6.6=0.11.,10,636=10.11,.,(,先把,36,化为分,),(,再把,6.6,化为度,),做一做,把,2336,化成用度表示的角,.,解:先把,36,化成度,即,36,(36,60),=0.6,所以,23,36,23.6,做一做,把,95.12,化成用度、分、秒表示的角,.,解:,0.12,60,0.12,7.2,0.2,60,0.2,12,95.12,95,712,做一做,计算,解:,观察钟的变化,每次变化两个指针间的角度变化是多少?,
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