画圈圈的求答案,看到的话帮个忙!
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/06/24 18:13:12
画圈圈的求答案,看到的话帮个忙!
![](http://img.wesiedu.com/upload/f/e5/fe56f6b907417e774b37f0427458c1b2.jpg)
![](http://img.wesiedu.com/upload/f/e5/fe56f6b907417e774b37f0427458c1b2.jpg)
![画圈圈的求答案,看到的话帮个忙!](/uploads/image/z/18713761-25-1.jpg?t=%E7%94%BB%E5%9C%88%E5%9C%88%E7%9A%84%E6%B1%82%E7%AD%94%E6%A1%88%2C%E7%9C%8B%E5%88%B0%E7%9A%84%E8%AF%9D%E5%B8%AE%E4%B8%AA%E5%BF%99%21)
(1)C=30° a/sinA=c/sinC a=csinA/sinC=√2
(2)B=107° b/sinB=a/sinA.
a=bsinA/sinB
=16*sin26°/sin107° c/sinC=b/sinB
c=bsinC/sinB=16*sin47°/sin107°
(3)sinA=asinB/b=1/2 A=30° C=30° c^2=a^2+b^2-2abcosC=36 c=6
(4) 根据正玄定理有a/b=sinA/sinB √2sinA=2sinBsinA sinB=√2/2 所以B=45°或者135°
2.(1)C=45°a=csinA/sinC=1 b=asinB/sinA=2sin105°
(2)sinA=asinB/b=√2/2,A=45° C=75° c=asinC/sinA=14√2sin75°
再问: 大神,在吗?
(2)B=107° b/sinB=a/sinA.
a=bsinA/sinB
=16*sin26°/sin107° c/sinC=b/sinB
c=bsinC/sinB=16*sin47°/sin107°
(3)sinA=asinB/b=1/2 A=30° C=30° c^2=a^2+b^2-2abcosC=36 c=6
(4) 根据正玄定理有a/b=sinA/sinB √2sinA=2sinBsinA sinB=√2/2 所以B=45°或者135°
2.(1)C=45°a=csinA/sinC=1 b=asinB/sinA=2sin105°
(2)sinA=asinB/b=√2/2,A=45° C=75° c=asinC/sinA=14√2sin75°
再问: 大神,在吗?