It's about one-third as big as a Tennis court.
In other words, 0.09 dunams is 0.344997120 times the size of a Tennis court, and the size of a Tennis court is 2.89857490 times that amount.(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 0.260760 dunams. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
It's about one-fourth as big as an IMAX screen.
In other words, 0.09 dunams is 0.25410 times the size of an IMAX screen, and the size of an IMAX screen is 3.9350 times that amount.(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.35420 dunams. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about one-fifth as big as a Basketball court.
In other words, 0.09 dunams is 0.18158424320 times the size of a Basketball court, and the size of a Basketball court is 5.507085760 times that amount.(per NBA regulation)
Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 0.49563771840 dunams. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.
It's about six times as big as a Parking Space.
In other words, the size of a Parking Space is 0.1670 times 0.09 dunams.(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 0.015 dunams. Due to the high real estate prices at the time, parking spaces in a densely-populated part of Manhattan would sell for an average of $165,000 in 2007, with some spaces fetching up to $225,000.
It's about one-fifteenth as big as Fort Knox.
In other words, the size of Fort Knox is 13.10 times 0.09 dunams.(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 1.180 dunams. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about one-fifteenth as big as a Hockey rink.
In other words, 0.09 dunams is 0.0593343188 times the size of a Hockey rink, and the size of a Hockey rink is 16.85365270 times that amount.(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 1.516828740 dunams. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about twenty times as big as a King Size Bed.
In other words, 0.09 dunams is 22.30 times the size of a King Size Bed, and the size of a King Size Bed is 0.0448 times that amount.(North American/Australian standard; length; mattress only)
A King-Size mattress measures 0.00403 dunams in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 0.005 dunams for those in positions of wealth or power.