we know that g = {πΊπ \over π ^2}Β orΒ M = {ππ ^2 \over πΊ}

βΉ Average density of the earth,Β Β *D *= {πππ π \overΒ ππππ’ππ} = {ππ
^2 \over πΊ Γππ}

(Where V e is the volume of the earth)

Or,Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β *D *= {ππ
^2 \overΒ πΊ{4\over3}ΟR^3} = {3g \overΒ 4 ΟGR}