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Usually a line is used to mean a straight line. However a line can also be curved. If you are asked to draw a line between two points always draw a straight line.

A line is one of the basic terms in geometry. We may think of a line as a "straight" line that we might draw with a ruler on a piece of paper, except that in geometry, a line extends forever in both directions.

We write the name of a line passing through two different points A and B as "line AB" or as prAB. Sometimes we use the two-headed arrow over AB signifying a line passing through points A and B.

The arrows signify that the lines drawn extend indefinitely in each direction.


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