Introduction to Euclid’s Geometry – Notes

Introduction to Euclid’s Geometry

Euclid’s Definitions

Definition 1: A point is that which has no part.

Definition 2: A line is breathless length.

Definition 3: The ends of a line are points.

Definition 4: A straight line is a line which lies evenly with the points on itself.

Definition 5: A surface is that which has length and breadth only.

Definition 6: The edges of a surface are lines.

Definition 7: A plane surface is a surface which lies evenly with the straight line on itself.