Question

The figure below shows a rope that circles the earth the radius of the earth is 6371 km assuming the rope makes a perfect circle what is the length of this rope? Give your answer in terms of PI.

Answer 1

The Solution:

Given that the radius of a circle is 6371km.

Required:

Find the length (perimeter) of the circle in terms of pi.

The formula for the perimeter of a circle is:

`Length=Perimeter=2\pi r`

Where r = 6371km.

`Length=2*\pi*6371=12742\pi km`

Answer:

`12742\pi km`