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A cylinder has three faces and two round surfaces.
Assume the question should read, "Round 7.77777 to the nearest thousandth ?"The rule when rounding off numbers is "If the first figure to be discarded is 5 or more then the previous figure is increased by 1".The first figure to be discarded is the fourth 7 after the decimal point. As this is 5 or more then the previous figure (the third 7 after the decimal point) is increased by 1 (to 8).7.77777 rounded to the nearest thousandth is 7.778.
it is called a sphere
It depends on how many dimensions you are asking about. If you are talking about a 2-dimensional figure then it would be a circle. The definition of a circle is the collection of points that are equidistant from the center. If you are talking about a 3-dimensional figure, then it would be a sphere. The definition of a sphere is the collection of points in three dimensions that are equidistant from the center.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.