F-r-e-e p-o-i-n-t-s for who is to answer first

Thanks

Thanks!

Step-by-step explanation:  :)

< 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⭐

y do u put "subscirbe to ence" on a app for ppl who need with their work?