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first definition
A point is that which has no part
Second definition
A line is breathless length
third definition
The extremities of a line our points
fourth definition
A straight line is a line which lies evenly with the points on itself
fifth definition
A surface is that which has length and breath only
sixth definition
The extremities of a surface are lines
seventh definition
A plane surface is a surface which lies evenly with the straight lines on itself
eighth definition
A plane angle is the inclination to one another of two lines in a plane which meet one another, and do not lie in a straight line
ninth definition
and when the lines containing the angle are straight, the angle is called rectilineal