![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
如图,DE是△ABC的边AB的垂直平分线,D为垂足,DE交AC于点E,且AC=8,BC=5,则△BEC的周长是()
A.12
B.13
C.14
D.15
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、13
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.12
B.13
C.14
D.15
B、13
A.2
B.3
C.4
D.5
如图1-1所示,已知αAB=225°16′30″,测得连接角及折角(左角)为:βB=35°20′42″、βC=190°24′54″、βD=170°18′12″。试计算各边的坐标方位角αBC、αCD、αDE各为多少?
A.125°
B.145°
C.175°
D.190°
A.30°
B.40°
C.50°
D.60°