You place a cup of 200of coffee on a table in a room that is 67of, and 10 minutes later, it is 195of. approximately how long will it be before the coffee is 180of? use newton's law of cooling:

< 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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