Gravity.
The path of gravity is a straight line from the origin of an object to the very center of the Earth. If you hold a piece of string up, it will hang in a straight line. Same thing with tension; if you apply tension to either end of a string in opposite directions, the string will stretch to become a straight line.
The surface of still water, due to gravity, is an entirely flat surface. It also represents a straight line.
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It is south of it. The Mason-Dixon line is basically the long straight border between Maryland and Pennsylvania. Tennessee is well south of it.
The Proclamation Line was created on October 7, 1763.
First Citizens Bank was created in 1993.
The straight-line distance from Mogadishu, Somalia to Banjul, Gambia is 4,305 miles. This is equal to a distance of 6,928 kilometers.
The coordinated axes grid or the Cartesian plane has a horizontal x axis number line and a vertical y axis number line that can be numbered in increments of 1/4 of an inch. Both axes are perpendicular to each other and they meet at right angles at the origin which is the coordinate of (0, 0) Straight line equations are plotted on the Cartesian plane which was created by the French mathematician Rene Descartes.