高考数学复习第3章三角函数解三角形第7讲正弦定理与余弦定理理市赛课公开课一等奖省名师优质课获奖.pptx

栏目导引,知能训练,轻松闯关,名师讲坛,素养提升,典例剖析,考点突破,教材回顾,夯实基础,第三章 三角函数、解三角形,第,7,讲正弦定理与余弦定理,第三章 三角函数、解三角形,1/37,定,理,正弦定理,余弦定理,内,容,_,2,R,(,R,为,ABC,外接圆半径,),a,2,_,；,b,2,_,；,c,2,_,b,2,c,2,2,bc,cos,A,c,2,a,2,2,ca,cos,B,a,2,b,2,2,ab,cos,C,2/37,定,理,正弦定理,余弦定理,变,形,形,式,cos,A,_,；,cos,B,_,；,cos,C,_,2,R,sin,A,2,R,sin,B,2,R,sin,C,sin,A,sin,B,sin,C,3/37,4/37,5/37,2,三角形解判断,A,为锐角,A,为钝角,或直角,图,形,关系式,解,个数,a,b,sin,A,b,sin,A,a,b,一解,两解,一解,一解,6/37,B,7/37,B,8/37,B,9/37,10/37,11/37,4,12/37,13/37,1,14/37,15/37,16/37,17/37,18/37,19/37,20/37,21/37,22/37,23/37,24/37,A,等腰直角三角形,25/37,26/37,27/37,28/37,29/37,30/37,31/37,交汇创新,解三角形与数列交汇,32/37,33/37,34/37,35/37,36/37,37/37,