Correction for the size of The Principality Stadium
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How big is 12.50 square kilometers?
It's about 300 times as big as The Principality Stadium
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The size of The Principality Stadium is about 0.04 square kilometers.
(a.k.a. Stadiwm Principality, f.k.a. Millennium Stadium, f.k.a. Stadiwm y Mileniwm) (Cardiff, Wales, United Kingdom) (total footprint)
The 70,000-person-plus capacity stadium of Cardiff, Principality Stadium has a total footprint of 0.04 square kilometers. Over 40,000 tonnes of concrete and steel during the construction of the stadium.