Physics question on radius of planets

Physics
Tutor: None Selected Time limit: 1 Day

The mean radius of a planet is 6.91 × 10^6 m, and that of its moon is1.42×10^8 cm.

From this data calculate the ratio of the planet’s surface area to that of its moon. 

Aug 18th, 2015

Thank you for the opportunity to help you with your question!

A=4pi r2

 ratio therefore will be;R2:r2

(6.91*10^6)^2:(1.42*10^8)^2

6.91:1.42

691:142

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Aug 18th, 2015

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