0.4 and 0.40 are the same amount is the word form of the decimals the same?

.4 and .40 are indeed the same amount.

We usually drop the 0 in the 100'ths place when it is not necessary for indicating money or solving a problem with 2 decimals.

Also realize that .400 .4000 etc are all the same as well.

< 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⭐