Description
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.
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Explanation & Answer
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The S.A of a sphere is 4piR^2
Hence planet's s.a is 4*22/7*6.91*10^6m*6.91*10^6m= 6.0026*10^14msquare
Moon's= 4*1.42*10^6*1.14*10^6*22/7=2.5349*10^13msquare
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