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A ball is a round, usually spherical but sometimes ovoid, object with various uses. They come in different sizes, depending on what they are used for. The standard size of a basketball is 75 to 75.88 cm in circumference. A football is allowed to be 69–71 cm in circumference, a handball up to 600 mm, a tennis ball around 67 mm and a golfball can have a diameter not less than 42.67 mm.