题目内容

在锐角中,角的对边分别是,且
(1)确定角的大小:
(2)若,且,求的面积.

(1)(2)

解析试题分析:(1)由正弦定理:              2’

                                            3’
                                                       4’
锐角三角形中                                            5’
                                                           6’
(2)                                          7’
                                                    8’
得:                                      9’
                                                           10’
                                 12’
考点:解三角形
点评:解三角形常利用正余弦定理实现边与角的互相转化,正弦定理:
,余弦定理:,

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