Answer to Question #6716 in Geometry for Arzo
tg(α/2) = (0.25/2)/2.8 = 5/112.
From the other side,
tg(α/2) = (D/2)/384000,
where D is the moon's diameter. So,
(D/2)/384000 = 5/112 ==> D = 5/112*384000*2 = 240000/7 km.
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