Wikipedia nonsense - meridian and metre

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Overview

Combining facts from the Wikipedia articles "History of the metre" and "Meridian" yields an earth circumference of around 80000 km.

Input

1)

en.wikipedia.org/wiki/Meridian_(geography)‎
A meridian (or line of longitude) is the half of 
an imaginary great circle on the Earth's surface

2)

en.wikipedia.org/wiki/History_of_the_metre‎
1⁄10,000,000 part of the quarter of a meridian

Output

From 2:

1 m = 1⁄10,000,000 of the quarter of a meridian

Insert 1:

1 m = 1⁄10,000,000 of the quarter of a (half of 
an imaginary great circle on the Earth's surface)

Reduce

1 m = 1⁄10,000,000 of 1/4 of 1/2 of imaginary great circle on the Earth's surface
1 m = 1/80,000,000 of imaginary great circle on the Earth's surface

Reformulate

imaginary great circle on the Earth's surface = 80,000,000 m = 80,000 km

Compare with equator

Compare that with:

Equator - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Equator‎
Wikipedia
Other planets and astronomical bodies have equators similarly defined. 
Earth's equator is  about 40,075 kilometres (24,901 mi) long