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Phobus one of the satelites of Mars evolves about Mars at a

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Intern
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Phobus one of the satelites of Mars evolves about Mars at a [#permalink] New post 25 Jun 2006, 16:27
Phobus one of the satelites of Mars evolves about Mars at a daistance of approximately 5800 miles from the center of mars and approximately 3700 miles from surface of mars. If it is assumed that Mars is spherical and the orbit of Phobus is circular, what is the approximate circumference in miles of Mars at its equator

A. 2100 pie
B 4200 pie
C 7400 pie
D 9500 pie
E 190,000 pie
Director
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Re: Gmat Math [#permalink] New post 25 Jun 2006, 16:34
GMATCUBS21 wrote:
Phobus one of the satelites of Mars evolves about Mars at a daistance of approximately 5800 miles from the center of mars and approximately 3700 miles from surface of mars. If it is assumed that Mars is spherical and the orbit of Phobus is circular, what is the approximate circumference in miles of Mars at its equator

A. 2100 pie
B 4200 pie
C 7400 pie
D 9500 pie
E 190,000 pie


2 x pi x (5800-3700) = B
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 [#permalink] New post 26 Jun 2006, 12:10
radius = 5800 - 3700
= 2100

Circum = 2pi2100--->4200pi
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 [#permalink] New post 26 Jun 2006, 14:52
another one for (B)
r = 2100
circumfrence = 2pi(r) = 4200pi = (B)
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 [#permalink] New post 26 Jun 2006, 14:58
2 * pi * (5800 - 3700) = 4200 * pi (B)
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 [#permalink] New post 26 Jun 2006, 16:54
B. (5100-3700) x 2 x pi = 4200 x pi
  [#permalink] 26 Jun 2006, 16:54
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Phobus one of the satelites of Mars evolves about Mars at a

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