Math 465: Foundations of Geometry

Math 584: Euclidean and Non-Euclidean Geometry

Information Page, Spring 2026



A short biography of Euclid and Euclid

Here is a nice article about finite geometries.

Here is a short discussion of affine and projective planes.


Here is a discussion of Ptolemy's theorem.

Nine point circle

Here are some properties of the nine-point circle.


Here is a discussion of Ceva and Menealus's Theorems, with several proofs and additional topics

Here and here you will find a discussion of the orthic traingle and its properties.

Here is a "proof" that all triangles are equilateral.


Here is a discussion of the Simson line.

Here and here is a discussion of Miquel point.

Here is a proof of Miguel point theorem (Pivot theorem) and also several properties of the Simson line.


Here is a discussion of the Wallace-Gerwien-Bolyai Theorem. Here is a discussion of an analogous problem in three dimensions (often called Hilbert's third problem).


Here is a nice discussion of inversion. See various links at the bottom which all show various applications of inversions. In particular, read the one about Apollonian circles theorem, which is related to problem 39.10.

Here is another place where many interesting results related to inversion are discussed.

Here is a short discussion of inversion with many references.


Here is a discussion and visualization of hyperbolic geometry.


Solutions to Exam 1.

Assignments

Assigments must be written carefully. You are allowed (even encouraged) to discuss the assigments with other students but you have to write the solutions on your own. Identical solutions will not be graded. If your solutions are not written clearly, they will not be graded and you will receive no credit.

Quizzes