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Let mass of sun = M
mass of planet = m
Time period = T
radius = r

T=2 \pi  \sqrt{ \frac{r^3}{GM} } \\ \\ \Rightarrow T^2=4 \pi ^2(\frac{r^3}{GM})=\frac{4 \pi ^2r^3}{GM}\\ \\ \Rightarrow M= \frac{4 \pi ^2r^3}{GT^2}
1 5 1
a small dought in second step how did u get 4pi2
square both sides
i dont have points but i have many doughts how should i ask u know