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# Phobus, one of the satellites of Mars, revolves about Mars

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Intern
Joined: 08 Nov 2008
Posts: 29
Phobus, one of the satellites of Mars, revolves about Mars [#permalink]

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08 Nov 2008, 21:09
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Phobus, one of the satellites of Mars, revolves about Mars at a distance of approximately 5,800 miles from the center of Mars and approximately 3,700 miles from the 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. 2,100π
B. 4,200π
C. 7,400π
D. 9,500π
E. 190,000π
Intern
Joined: 07 Nov 2008
Posts: 31
Re: phobus--29 [#permalink]

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08 Nov 2008, 21:45
petercao wrote:
Phobus, one of the satellites of Mars, revolves about Mars at a distance of approximately 5,800 miles from the center of Mars and approximately 3,700 miles from the 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. 2,100π
B. 4,200π
C. 7,400π
D. 9,500π
E. 190,000π

the circumference of mars is (5,800-3700)*2π

B
Re: phobus--29   [#permalink] 08 Nov 2008, 21:45
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# Phobus, one of the satellites of Mars, revolves about Mars

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