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A line is the second simplest geometric shape and is one-dimensional, meaning it has only length. A straight line is infinitely long, with no beginning or end. It is typically represented by a lowercase letter, such as p. A line is usually defined by two points, as any two points determine exactly one line. A ray is similar to a straight line, but it has a defined starting point and extends infinitely in one direction. For example, the arms of an angle are formed by rays.
