How did u get ur answer

< 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⭐

include a picture of the drawing in order for me to

step-by-step explanation:

i need more details sorry

step-by-step explanation:

27 +27 or 27times 2=54

the diffrence is 0