How to measure the size of the earth when using a card board box ,string ,and starophone ?

Question

hey everybody this is arobb i need and answer to my question because me and my friend is doing a project on the earth so i really need this answer

Answer 1

If you mean size as in circumference, like as a circle. Then you need one of your materials to have a measurement (ruler) or size (box is 14 feet long). Well you would need a map and measure from the end of the map to other end with measurer and approximate the distance to get size using the key of distance at the top or bottom or wherever it is.

Answer 2

What is a starophone???