Question

Please Answer Please ​

Answer 1

Step-by-step explanation:

in ∆OCD by using angle sum property

<ocd+<cdo+<doc=180

30+30+<doc=180

60+<doc=180

<doc=180-60

<doc=120,

<dab+<abc=180 (adjacent angles),

100+<abc=180

<abc=180 -100

<abc=80,