349 square meters is about one-and-one-third times as big as a Tennis court
In other words, it's 1.3378222 times the size of a Tennis court, and the size of a Tennis court is 0.74748348 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 260.87174 sq. m. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
