alenardbms6987 alenardbms6987
  • 23-07-2017
  • Mathematics
contestada

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

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irspow
irspow irspow
  • 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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