Definitions
1. A point is that of which there is no part.
2. And a line is a length without breadth.
3. And the extremities of a line are points.
4. A straight-line is whatever lies evenly with points upon itself.
5. And a surface is that which has length and breadth alone.
6. And the extremities of a surface are lines.

• The first six of Euclid’s definitions attempt to define the three undefined terms in geometry: points, lines, and planes. Do you think that these definitions are sufficient? Why or why not?

Question

Definitions
1.	A point is that of which there is no part.
2.	And a line is a length without breadth.
3.	And the extremities of a line are points.
4.	A straight-line is whatever lies evenly with points upon itself.
5.	And a surface is that which has length and breadth alone.
6.	And the extremities of a surface are lines.

•	The first six of Euclid’s definitions attempt to define the three undefined terms in geometry: points, lines, and planes.  Do you think that these definitions are sufficient?  Why or why not?