What is 48,978 written in scientific notation?
a. 4.8978 x 10
b. 4.8978 x 10
c. 4.8978 x 10
d. 48.978 x 10

< 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⭐

529 and 531

step-by-step explanation: