For those interested in ground sizes, these are the current measurements, according to the latest AFL Record Season Guide.
grounds.PNG
As can be seen, while the SCG is the shortest ground, it isn't really significant. Compared to the two Melbourne grounds, it's 5m shorter than Etihad and 6m shorter than the MCG, but it's actually 7m wider than Etihad. Further looking at width, the SCG is the third widest ground, with it's 136m only being surpassed by the 138m of the Gabba and Canberra. So all up, it could probably be claimed that there is a rough equivalence in playing areas of the current venues.
Of course, if somebody who is particularly good at calculus, wants to work out the actual playing areas; feel free.
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