tolong ya kak besok dikumpulkan please

1a.
<AOC+<BOC=180
105+<BOC=180
<BOC=180-105
<BOC=75

1b.
82+<AOC=180
<AOC=180-82
<AOC=98

3a.
2a+68=180
2a=112
a=56

5b+12+2b=180
7b+12=180
7b=168
b=24

3b.
=a+68
=56+68
=124

=5b+12
=5(24)+12
=120+12
=132