imagine putting a rope around the earth. add 20m to the length of the rope concentrically around the earth. Could you walk under it without hitting your head?

Question

Could you walk under it without hitting your head?

Answer 1

Is this really a Calculus question?

The radius of the Earth is 6378 km at the equator

The circumference of the Earth is 40,074.155989 km

The length of the rope is 40,074.175989   (20m = 0.02km)

The rope makes a circle with radius 6378.003 km

Is that enough?