It's about 0.00000002 times as big as The Great Banyan Tree
In other words, 0.00000002850 hectares is 0.00000001980 times the size of The Great Banyan Tree, and the size of The Great Banyan Tree is 50,500,000 times that amount.(a.k.a. The Great Banyan, a.k.a. Ficus benghalensis) (Acharya Jagadish Chandra Bose Indian Botanic Garden, Howrah, West Bengal, India)
The Great Banyan Tree is a single tree in the Indian Botanic Garden in West Bengal with aerial roots covering a total area of about 1.440 hectares. While its exact age is unknown, the tree has been noted in guidebooks for over 200 years.
It's about 0.00000002 times as big as The Biltmore Estate
In other words, 0.00000002850 hectares is 0.00000001750 times the size of The Biltmore Estate, and the size of The Biltmore Estate is 57,100,000 times that amount.(Asheville, North Carolina) (house only)
The main house of Biltmore Estate covers 1.630 hectares and contains 250 rooms. The fifty-six auxiliary buildings of the estate are interconnected through the nearly 71 km of roads on the Biltmore grounds.
It's about 0.000000009 times as big as The Lincoln Memorial Reflecting Pool
In other words, 0.00000002850 hectares is 0.000000009050 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 110,000,000 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 0.000000008 times as big as Federation Square
In other words, 0.00000002850 hectares is 0.00000000750 times the size of Federation Square, and the size of Federation Square is 130,000,000 times that amount.(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 0.000000007 times as big as The Philippine Arena
In other words, 0.00000002850 hectares is 0.00000000710 times the size of The Philippine Arena, and the size of The Philippine Arena is 140,000,000 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 0.000000007 times as big as The Principality Stadium
In other words, 0.00000002850 hectares is 0.00000000700 times the size of The Principality Stadium, and the size of The Principality Stadium is 100,000,000 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 4 hectares. Over 40,000 tonnes of concrete and steel during the construction of the stadium.
It's about 0.000000006 times as big as a Polo field
In other words, 0.00000002850 hectares is 0.000000005680952720 times the size of a Polo field, and the size of a Polo field is 176,026,813 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.