Please HELP WILL GIVE 60 POINTS

4. 1=

5. 3

6. i cant see the rest of the answer

im sorry but no. i just need to answer for 50 poonts oof

< 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⭐