the actual diameter of the object is 1.017×10⁵km
actual diameter, d = any line segment that passes through the center of the circle
angular diameter, θ = the angle that an actual diameter of an object makes.
distance, D= the actual path travel
distance of the object ,D= 1.4 billion = 1.4×10⁹km
angular diameter of an object,θ = 15arc
θ = 15 ×π/ (60×60×180) rad
[ ∵ 1 revolution = 2π = 360°×60×60]
Using the relation,
θ = d/D {angular diameter = actual diameter/ distance}
d = θD
d = 1.4×10⁹×[15×3.14/(60×60×180) ] km
= 1.017×10⁵km
This shows the actual diameter of the object is 1.017×10⁵km
It is the physical size of object.
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