Question
If the angular diameter of the sun is 20, how far from
the eye a coin of radius 3.3 cm be kept to hide the sun?Solution
Arc AB = Diameter of coin = 3.3 × 2 = 6.6 cm θ = 20 = (20/60)θ = (1/3)θ θ in radian = ((1/3) x (22/7)/540)c = ((22/7)/540)c θ = arc/radius = (22/7)/540 = 6.6/r r = (6.6 x 540)/22 × 7 = 1134 cm.
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