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Logical Reasoning
Number Series
If S1 and S2 be the whole surface of a sphere and the curved surface of the circumscribed cylinder, then S1 is equal to
a)S2, b)2S2 c)(1/2)S2 d)(2/3)S2
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- ANS: A
Explanation:
Let the radius of the sphere be r.
The radius of the circumscribing cylinder = r
H = height of the cylinder = Diameter of the sphere = 2r
Whole surface of the sphere = 4r^2 ___(1)
Curved surface of the cylinder = (2r)H = (2r)2r = 4r^2 ___(2)
From (1) and (2), Whole surface of a sphere = Curved surface of the circumscribed cylinder
= 4r2
- 12 years agoHelpfull: Yes(5) No(1)
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