Perbandingan antara massa planet C dan D 4:9 sementara itu,perbandingan antara percepatan gravitasi ke dua planet 16:25 perbandingan antara jari-jari planet C d

r2 = jari jari planet D
r1 = jari jari planet C
m1 : m2 = 4 : 9
m1 = 4/9 m2


[tex] \frac{G1}{G2} = \frac{ G\frac{m1}{(r1) ^{2} } }{ G\frac{m2}{(r2)^{2} } } = \frac{ \frac{ \frac{4}{9}m2 }{(r1) ^{2}} }{ \frac{m2}{(r2) ^{2} } } = \frac{ \frac{4}{9}m2 \times (r2)^{2} }{(r1) ^{2} \times m2} \\ \frac{16}{25} = \frac{4 \times (r2) ^{2}}{9 \times (r1) ^{2}} \\ \frac{36}{25} = \frac{(r2) ^{2}}{(r1) ^{2}} \\ \frac{6}{5} = \frac{r2}{r1} [/tex]
R1 : R2 = 5 : 6