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23-07-2017
Mathematics

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Find the angular size of a circular object with a 3-inch diameter viewed from a distance of 4 yards.

Respuesta :

23-07-2017

sin(α/2)=r/d

α/2=arcsin(r/d)

α=2arcsin(r/d)

r=radius of object=1.5 in, d=distance=144 in. so:

α=2arcsin(1.5/144)

α=1°11' 37"

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