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there is this formula mg = GMm/R2 (R square) here m = mass of any body on surface on earth g = 9.8 m/s square G = 6.67*10 to the power -11 M = mass of earth R is radius of earth Thus Radius is equal to R=Square root of GM/g Mass of earth is 5.9*10 to the power of 24 kg R = substitute the values you’ll get R = 6336885 i.e. 63368.
