Euclid's Elements Book I, Definitions.
Level: Middle and High School, SAT Prep, College
Euclid's Book 1 begins with 23
definitions — such as point, line, and surface. Following a
The first few
Definition 1. A point is
that which has no part.
Definition 2. A line is
Definition 3. The
extremities of a line are points.
Definition 4. A straight
line is a line which lies evenly with the points on