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How big is 138 square meters?

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It's about one-three-hundred-fiftieth as big as The Principality Stadium
In other words, 138 square meters is 0.00 times the size of The Principality Stadium, and the size of The Principality Stadium is 300 times that amount.
(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 40,000 sq. m. Over 40,000 tonnes of concrete and steel during the construction of the stadium.
It's about one-three-hundred-fiftieth as big as a Polo field
In other words, 138 square meters is 0.0027507771 times the size of a Polo field, and the size of a Polo field is 363.533634 times that amount.
(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 50,167.6416 sq. m. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.
It's about one-three-hundred-fiftieth as big as Rogers Centre
In other words, 138 square meters is 0.0027 times the size of Rogers Centre, and the size of Rogers Centre is 373 times that amount.
(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 51,400 sq. m over the entire complex. The video board of Rogers Centre has a total area of 340 sq. m.
It's about one-four-hundredth as big as Windsor Castle
In other words, 138 square meters is 0.003 times the size of Windsor Castle, and the size of Windsor Castle is 380 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53,000 sq. m. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about one-five-hundredth as big as Croke Park
In other words, 138 square meters is 0.002 times the size of Croke Park, and the size of Croke Park is 480 times that amount.
(a.k.a. Páirc an Chrócaigh) (Dublin, Leinster, Ireland) (stadium area)
Croke Park, the Gaelic games stadium of Dublin, hosts hurling and Gaelic football matches in a 65,000 sq. m stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about one-five-hundred-fiftieth as big as Buckingham Palace
In other words, 138 square meters is 0.002 times the size of Buckingham Palace, and the size of Buckingham Palace is 560 times that amount.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 77,000 sq. m of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about one-six-hundred-fiftieth as big as Alcatraz
In other words, 138 square meters is 0.002 times the size of Alcatraz, and the size of Alcatraz is 630 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 89,000 square meters. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.