[b][url=https://mathcs.clarku.edu/~djoyce/java/elements/bookI/defI1.html]Definition 1[/url]. [/b]A [i]point[/i] is that which has no part.
[b][url=https://mathcs.clarku.edu/~djoyce/java/elements/bookI/defI2.html]Definition 2[/url]. [br][/b]A [i]line[/i] is breadthless length.[br][br][b][url=https://mathcs.clarku.edu/~djoyce/java/elements/bookI/defI3.html]Definition 3[/url].[br][/b]The ends of a line are points.[br][br][b][url=https://mathcs.clarku.edu/~djoyce/java/elements/bookI/defI4.html]Definition 4[/url]. [br][/b]A [i]straight line[/i] is a line which lies evenly with the points on itself.