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51 squares is about one-and-four-fifths times as big as a Tennis court.
In other words, it's 1.81623930 times the size of a Tennis court, and the size of a Tennis court is 0.550588240 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 28.067973 squares. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
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