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

Question

asked Mar 24, 2018 233k views

1 Answer

Nimi · Answer 1 · 2018-03-28T15:40:37+0000

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"