PLSSS HELP IF YOU TURLY KNOW THISS

8.7+x=7×1.1

8.7+x= 7.7

8.7-7.7=x

1=x

x=1

< 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⭐

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.