PLEASE HELP! 10 POINTS! I WILL MARK BRAINLIEST!! there are three separate questions, look at photo for the questions and information. *ignore the graph part, you don’t need to do that*

12. Line F

Step-by-step explanation:

12. It was on the slope

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐