Whats 9+10? You dont know it could be 19, or it could be 21
Whoever gets it right I may give brainliest

br.uh sooo easy

Step-by-step explanation:

its 19 and 21 duh

19

Step-by-step explanation:

i am so confused by what you wrote

< 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⭐

because they could drop even lower..