高考数学复习第三章三角函数解三角形第8课时正弦定理余弦定理应用举例理市赛课公开课一等奖省名师优质课获.pptx

第,*,页,返回导航,高三大一轮复习学案,主干回顾 夯基固源,考点研析 题组冲关,课时规范训练,素能提升 学科培优,1/55,2/55,3/55,已知条件,应用定理,普通解法,一边和两角(如,a,，,B,，,C,),正弦定理,由,A,B,C,180，求角,A,；由正弦定理求出,b,与,c,.,在有解时只有一解,两边和夹角(如,a,，,b,，,C,),余弦定理,正弦定理,由余弦定理求第三边c；由正弦定理求出小边所正确角；再由ABC180求出另一角,在有解时只有一解,4/55,三边(,a,，,b,，,c,),余弦定理,由余弦定理求出角,A,、,B,；再利用,A,B,C,180，求出角,C,.,在有解时只有一解,两边和其中一边对角(如a，b，A),正弦定理,余弦定理,由正弦定理求出角,B,；由,A,B,C,180，求出角,C,；再利用正弦定理或余弦定理求,c,.,可有两解，一解或无解,5/55,6/55,7/55,8/55,9/55,10/55,11/55,12/55,13/55,14/55,15/55,16/55,17/55,18/55,19/55,20/55,21/55,22/55,23/55,24/55,25/55,26/55,27/55,28/55,29/55,30/55,31/55,32/55,33/55,34/55,35/55,36/55,37/55,38/55,39/55,40/55,41/55,42/55,43/55,44/55,45/55,46/55,47/55,48/55,49/55,50/55,51/55,52/55,53/55,54/55,55/55,