Question

1234题 第一题有我的笔记,改成DOA=25°

Answer 1

1、BOD=AOB-DOA=180-25=17=165

2、BOC=AOC-AOB

AOB=AOD-BOD

BOC=AOC-AOD+BOD=78-135+78=21

3 、BOD=0.5*BOC

BOC=180-AOC=180-40=140

BOD=0.5*140=70

4、DOE=0.5*AOD

AOD=180-BOD=180-100=80

DOE=0.5*80=40