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Line is the second simplest geometric shape and it's one-dimensional (it has only length). The straight line is infinitely long straight line, which has neither beginning nor end. The line is mostly represented using small block letters, for example p. The line is usually specified by two points because any two points can result in just one line. There is also a ray, which is similar to a straight line, with the only difference that it has a beginning (but still no end). For example, the arms of an angle are formed by the rays.
