Which explains whether or not this model accurately shows 16 × 3?
it does because 16 = 10 + 6, and the model shows 3 groups of 10 and 1 group of 6.
it does because 16 = 10 + 6, and the model shows 3 groups of 10 and 3 groups of 6.
it does not because the model should show only one group of 16 and one group of 3.
it does not because the model should show 6 groups of 10 and 6 groups of 3.

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< 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

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