47 A bookshelf at a library is 4 feet 1 inch. There are 14 copies of the same book on the
shelf, which fit the shelf exactly. What is the width of the books?
3 4/12 inches
3 inches
31/2 inches
39/12 inches
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10:31 AM
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2160ft3

step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft

a. true

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