How many books are in Euclid's Elements of Geometry?
Explanation
The answer is not 13, but rather 13 books in total. Euclid's "Elements of Geometry" is a comprehensive mathematical treatise, consisting of 13 separate books. Each book covers a different aspect of geometry, such as plane geometry, the properties of circles, and the geometry of solids. Euclid's work laid the foundation for the field of mathematics and geometry, and it remains one of the most influential and enduring works in the history of mathematics.