another maths question

[Oldboy913]

If you could built a fence around the world consisting of lots of posts 48 inches high with a single strand of wire on the top, how much extra wire length would you need if you made the posts one inch taller. Use 24 thousand miles for the circumference and a wire half an inch in diameter

[New Judge]

2 pi times 1 inch (about 6 and a quarter inches).

The size of the earth is immaterial. The extra needed is 2 pi times the extra radius.

[Loosehead]

The judge is correct, this question often baffles but is really quite a simple realisation that the size of the circle is irrelevant.

[mibn2cweus]

Given the length of the wire I can't image having any difficulty stretching it out another 6.3 inches in length however with all them poles to raise, one of these might come in handy: pole stretcher