八年级上阶段方法技巧训练：三角形内角和与外角和的几种常见

Tostudyandimplementthespiritofthetwosessionsistheprimarypoliticaltaskoftheeducatorsin2018.Throughthestudyofthespiritofthetwosessions,IhaveaprofoundawarenessthatthekeytotheprosperityanddevelopmentofthecountryliesintheParty,andthekeytotheall-roundrejuvenationofthenationliesineducation.ThetwosessionswereheldonMarch3,andthetwosessionshaveattractedmuchattention.TheCongressofdemocracy,unity,harmony,andpragmatismhasdeterminedtheworkofeconomicandsocialdevelopmentin2018,whichisofgreatsignificanceforfurtherpromotingscientificdevelopment,promotingsocialharmony,andcontinuouslyopeningupanewsituationforthecauseofsocialismwithChinesecharacteristics.Atpresent,themostimportantpoliticaltaskbeforeusistoconcentrateonthetwoWillspiritstudywell,carryoutwell.Reformisstillthefocusofthisyear'stwosessions.Ourpartyshouldcontinuetodeepenthereforminanall-roundwayandunswervinglygoon,andpromotethemodernizationofthenationalgovernancesystemandgovernanceability,whichrequiresthePartytoimproveitsgoverningabilityandefficiencyandraiseitsworklevel.Theanti-corruptionissueisalsothefocusofmoreefforts,becauseinthepastyear,ourcountryhasmadegreatprogressontheroadoffightingcorruptionandpromotingintegrity,andhascrackeddownonmanycorruptofficials.Tothosewhodonotwholeheartedlyforthewelfareofthepeopleofthegovernmentpersonnelheavyblowandwarning.Anditispreciselybecauseofthevigorousadministrationofthepartyandthestatethatsomepublicfundseatanddrink.Corruptionandotherphenomenahavemostlydisappeared,sothisyear'sdeepreform阶段方法技巧训练（二）专训1三角形内角和与外角和的几种常见应用类型习题课Tostudyandimplementthespiritofthetwosessionsistheprimarypoliticaltaskoftheeducatorsin2018.Throughthestudyofthespiritofthetwosessions,IhaveaprofoundawarenessthatthekeytotheprosperityanddevelopmentofthecountryliesintheParty,andthekeytotheall-roundrejuvenationofthenationliesineducation.ThetwosessionswereheldonMarch3,andthetwosessionshaveattractedmuchattention.TheCongressofdemocracy,unity,harmony,andpragmatismhasdeterminedtheworkofeconomicandsocialdevelopmentin2018,whichisofgreatsignificanceforfurtherpromotingscientificdevelopment,promotingsocialharmony,andcontinuouslyopeningupanewsituationforthecauseofsocialismwithChinesecharacteristics.Atpresent,themostimportantpoliticaltaskbeforeusistoconcentrateonthetwoWillspiritstudywell,carryoutwell.Reformisstillthefocusofthisyear'stwosessions.Ourpartyshouldcontinuetodeepenthereforminanall-roundwayandunswervinglygoon,andpromotethemodernizationofthenationalgovernancesystemandgovernanceability,whichrequiresthePartytoimproveitsgoverningabilityandefficiencyandraiseitsworklevel.Theanti-corruptionissueisalsothefocusofmoreefforts,becauseinthepastyear,ourcountryhasmadegreatprogressontheroadoffightingcorruptionandpromotingintegrity,andhascrackeddownonmanycorruptofficials.Tothosewhodonotwholeheartedlyforthewelfareofthepeopleofthegovernmentpersonnelheavyblowandwarning.Anditispreciselybecauseofthevigorousadministrationofthepartyandthestatethatsomepublicfundseatanddrink.Corruptionandotherphenomenahavemostlydisappeared,sothisyear'sdeepreform三角形内角和与外角和有着广泛的应用，利用它们可以解决有关角的很多问题，一般可用于直接计算角度、三角尺或直尺中求角度、与平行线的性质综合求角度、截角或折叠问题中求角度等．Tostudyandimplementthespiritofthetwosessionsistheprimarypoliticaltaskoftheeducatorsin2018.Throughthestudyofthespiritofthetwosessions,IhaveaprofoundawarenessthatthekeytotheprosperityanddevelopmentofthecountryliesintheParty,andthekeytotheall-roundrejuvenationofthenationliesineducation.ThetwosessionswereheldonMarch3,andthetwosessionshaveattractedmuchattention.TheCongressofdemocracy,unity,harmony,andpragmatismhasdeterminedtheworkofeconomicandsocialdevelopmentin2018,whichisofgreatsignificanceforfurtherpromotingscientificdevelopment,promotingsocialharmony,andcontinuouslyopeningupanewsituationforthecauseofsocialismwithChinesecharacteristics.Atpresent,themostimportantpoliticaltaskbeforeusistoconcentrateonthetwoWillspiritstudywell,carryoutwell.Reformisstillthefocusofthisyear'stwosessions.Ourpartyshouldcontinuetodeepenthereforminanall-roundwayandunswervinglygoon,andpromotethemodernizationofthenationalgovernancesystemandgovernanceability,whichrequiresthePartytoimproveitsgoverningabilityandefficiencyandraiseitsworklevel.Theanti-corruptionissueisalsothefocusofmoreefforts,becauseinthepastyear,ourcountryhasmadegreatprogressontheroadoffightingcorruptionandpromotingintegrity,andhascrackeddownonmanycorruptofficials.Tothosewhodonotwholeheartedlyforthewelfareofthepeopleofthegovernmentpersonnelheavyblowandwarning.Anditispreciselybecauseofthevigorousadministrationofthepartyandthestatethatsomepublicfundseatanddrink.Corruptionandotherphenomenahavemostlydisappeared,sothisyear'sdeepreform1类型直接计算角度1．如图，在△ABC中，∠A＝60°，∠B＝40°，点D，E分别在BC，AC的延长线上，则∠1＝________.80°Tostudyandimplementthespiritofthetwosessionsistheprimarypoliticaltaskoftheeducatorsin2018.Throughthestudyofthespiritofthetwosessions,IhaveaprofoundawarenessthatthekeytotheprosperityanddevelopmentofthecountryliesintheParty,andthekeytotheall-roundrejuvenationofthenationliesineducation.ThetwosessionswereheldonMarch3,andthetwosessionshaveattractedmucha