ʱ : һ 新课标数学核心素?衔接预科班人教版七年级上??章几何图形初? 角的比较与运?同步练习 含答?- 百度文库ϿʼĶ
ԡDOE=AOB+BOC
= (AOB+BOC)
=AOC=130=65.
11.:1,2,3,4һܽΪ360,ٸĿС1á2á3á4=1134,Կô. :1=x,
2=x,3=3x,4=4x. ,x+x+3x+4x=360, 9x=360,x=40.
ʡ1=40,2=40,3=120,4=160. Ӧ
12.:,֪NAB=35,NAC=60,
ԡBAC=NAC-NAB=60-35=25. ΪNAC=60,NAD=145,
ԡDAC=NAD-NAC=145-60=85.
:ABAC֮ļнΪ25,ADAC֮ļнΪ85.