发布时间:2021-02-20 01:28:14
(本小题满分12分)
在中,内角对边的边长分别是,已知,.
(Ⅰ)若的面积等于,求;
(Ⅱ)若,求的面积.
(Ⅰ),,(Ⅱ)
(Ⅰ)由余弦定理及已知条件得,,
又因为的面积等于,所以,得.······················ 4分
联立方程组解得,.··········································· 6分
(Ⅱ)由题意得,
即,··································································· 8分
当时,,,,,
当时,得,由正弦定理得,
联立方程组解得,.
所以的面积.·················· 12分