Determinar la regla general de las siguientes sucesiones: 6, 9, 12, 15, 18...
-8, -2, 4, 10, 16...
9,5, 1, -3, -7...

< 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⭐

step-by-step explanation:

but there’s no any figure there!