Which equation is an example of the commutative property of multiplication?
(4 +21) = (21 + 4)
(4 + 21) (3 - 51) = (3-51)(4 + 21)
(4 + 21(3-5) = (4 + 21(3 - 5)(1)
(4 + 21) = (4 + 2i + 0)

< 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⭐

.19875994384

step-by-step explanation:

1699/ 8548