How much longer is a 2 1/2 inch-long piece of string than a 2/5 long piece of string?

It is 21/10 or 2.1 inches longer

Step-by-step explanation:

2 1/2 - 2/5

= 5/2-2/5

25/10-4/10= 21/10

It is 21/10 or 2.1 inches longer

< 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⭐

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step-by-step explanation: