One-fifth divided by 6, five divided by one-forth, one-forth divided by 7 and one-third divided by 9

its like 1/9

Step-by-step explanation:

If you get it wrong, please let me know so I could fix my mistakes and hopes this helps :).

20

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⭐