The term that indicates imaginary parallel lines that circle the Earth is "latitude." Latitude lines run horizontally around the globe, measuring the distance north or south of the Equator. These lines are used in geographic coordinate systems to help locate positions on the Earth's surface.
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The 49th parallel north is a latitudinal circle on the Earth that is 49 degrees above the Earth's equator. This imaginary line is used as the border between the United States and Canada.
s diameter of the circle in the drawing above is the segment
parallel lines = a set of parallel lines above
It can refer to degrees if it is above and slightly to the right. A dot, (not a circle) directly above a number would represent a repeating digit in the decimal representation of a number.
Real numbers are the subset of complex numbers with the property that their imaginary part is zero. Since the above number has no imaginary part, it is a real number.