Question
Spheres A and B have their radii 40 cm and 10 cm respectively. The ratio of the surface area of A to the surface area of B is :
Answer: Option D
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Let the radii of A and B be r and R respectively .
`:.` Required ratio = `(4 pi r^2)/(4 pi R^2) = r^2/R^2 = (r/R)^2 = (40/10)^2 = `16 : 1.
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