It's about as big as Federation Square
(Melbourne, Victoria, Australia)
Federation Square, the large public square in the city center of Melbourne, measures 3.80 hectares. The main portion of the square is floored with sandstone blocks from Western Australia.
It's about as big as The Principality Stadium
(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 4 hectares. Over 40,000 tonnes of concrete and steel during the construction of the stadium.
It's about as big as The Philippine Arena
In other words, 3.80 hectares is 0.95 times the size of The Philippine Arena, and the size of The Philippine Arena is 1.1 times that amount.(Ciudad De Victoria, Bocaue - Bulacan, Philippines) (total footprint)
The largest indoor arena in the world, the multi-use Philippine Area has a total footprint of 4 hectares, with the dome itself occupying 3.60 hectares. The floor the arena contains over 9,000 tons of steel.
It's about one-and-one-fifth times as big as The Lincoln Memorial Reflecting Pool
In other words, 3.80 hectares is 1.21 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 0.826 times that amount.(Washington, D.C.) (pool surface area)
The Lincoln Memorial Reflecting Pool has a water surface area of 3.150 hectares. The Pool has a sloping bottom and extends to 80 cm (30 in) in depth at its center.
It's about three-fourths as big as a Polo field
In other words, 3.80 hectares is 0.757460363 times the size of a Polo field, and the size of a Polo field is 1.32020109 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 5.01676416 hectares. 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 three-fourths as big as Rogers Centre
In other words, 3.80 hectares is 0.739 times the size of Rogers Centre, and the size of Rogers Centre is 1.35 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 5.140 hectares over the entire complex. The video board of Rogers Centre has a total area of 0.034 hectares.
It's about seven-tenths as big as Windsor Castle
In other words, 3.80 hectares is 0.72 times the size of Windsor Castle, and the size of Windsor Castle is 1.4 times that amount.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 5.30 hectares. 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.