The distance of marathon has changed several times in history. Let's take a look first:
1896:40 km
1900: 40.26 km
1904:40 km
1906: 4 1.86 km
1908: 42.195km
19 12:40.2 km.
1920: 42.75 km
From 1924 to now: 42.438+095km.
Marathon is also divided into half marathon and quarter marathon. The whole half marathon is about 2 1km, and the whole quarter marathon10548.25m. ..