It's about one-twentieth as big as a Post-it® Note (3M)
In other words, the size of a Post-it® Note (3M) is 19 times 0.00000002850 hectares.(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.000000540 hectares in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.
It's about one-twentieth as big as a Playing Card
It's about one-one-hundred-fiftieth as big as an Apple iPad
In other words, 0.00000002850 hectares is 0.007121 times the size of an Apple iPad, and the size of an Apple iPad is 140.40 times that amount.(for 9.7 inch, Apple iPad Air MD785LL/B)
An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 0.0000040020 hectares. The base model iPad Air features 16 GB of storage capacity.
It's about one-three-hundred-fiftieth as big as an Airplane Tray Table
In other words, 0.00000002850 hectares is 0.00282 times the size of an Airplane Tray Table, and the size of an Airplane Tray Table is 355 times that amount.(average)
With wide variation among different models of airplanes, in-flight tray tables measure around 41.2 cm (16.5 in) x 24.1 cm (9.5 in) for a total area of 0.00001010 hectares. Flight safety rules require that the tray tables be upright and locked during takeoff and landing so as to reduce the risk of passenger abdominal injury.
It's about 400 times as big as a Ballpoint Pen Tip
In other words, 0.00000002850 hectares is 410 times the size of a Ballpoint Pen Tip, and the size of a Ballpoint Pen Tip is 0.0024 times that amount.(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen â€” a medium-tip â€” measures 0.0000000000700 hectares. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about one-four-thousandth as big as a Bath Towel
In other words, 0.00000002850 hectares is 0.00026296 times the size of a Bath Towel, and the size of a Bath Towel is 3,802.90 times that amount.(for Fieldcrest Luxury Solid Towels)
Bath towels typically measure 142.24 cm (56 in) by 76.2 cm (30 in), for a total area of about 0.00010838 hectares. The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about one-fifteen-thousandth as big as a King Size Bed
In other words, the size of a King Size Bed is 14,100 times 0.00000002850 hectares.(North American/Australian standard; length; mattress only)
A King-Size mattress measures 0.000403 hectares in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 0.0005 hectares for those in positions of wealth or power.