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Is 0.1980 square perches as big as an Airplane Tray Table?

It's about 50 times as big as an Airplane Tray Table
The size of an Airplane Tray Table is about 0.00399 square perches.
(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 0.00399 square perches. 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.
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