The length of the driveway shown on a blueprint is 2 inches. If the actual length of the driveway is 20 ft. what is the scale of the blueprint? A. 1 in. = 1 ft B. 1 in. = 2 ft. C. 1 in. = 10 ft D. 1 in. = 40 ft

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Step-by-step explanation:

< 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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