It is based on some data.
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In a Frequency Polygon, a line graph is drawn by joining all the midpoints of the top of the bars of a histogram. A frequency polygon gives the idea about the shape of the data distribution. The two end points of a frequency polygon always lie on the x-axis.
No, a line is not a polygon. A polygon is a closed plane area bounded by straight sides. A line, by itself, does not contain an area.
The sides of a polygon are straight line boundaries of the polygon.
concave polygon
a polygon a polygon * * * * * No it is not! If the line is in that plane then it is the whole line. If not, it is a single point.