建筑测量作业1(14)

D 120 48 BB 0.028m

206265

2.

解：△xA1=x1-xA=-87.36m △yA1=y1-yA=-75.92m △xA2=x2-xA=-87.36m △yA2=y2-yA=75.92m

DA1 XA12 YA12 115.739m

DA2 XA22 YA22 115.739m

A1

Y 75.92

artanA1 artan artan0.869 180°+41°=221°

XA1 87.36

A2 artan

YA275.92

artan artan( 0.869) 180°-41°=139° XA2 87.36

∠BA1=360°-（αAB-αA1）=284°15´30″

∠BA2=360°-（αAB-αA2）=202°15´30″