what is a length? What is breadthless? In this question ， square etc. ，。

radius of circle， Euclids Definitions Euclid listed some definitions. Some of them are A point is that which has no part. A line is breadthless length. The ends of a line are points. A straight line is a line which lies evenly with the points on itself. A surface is that which has length and breadth only. The edges of a surface are lines. A plane surface is a surface which lies evenly with the straight lines on itself. We observe that in the definitions， we try to define some terms like parallel lines， some things need to be explained further. Like In Definition 2 - A line is breadthless length. 。

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