# Geometry in Figures

Instructor: Anna Felikson In some of lessons we used ideas from the book "Geometry in Figures" by Arseniy Akopyan: links to the book in Russian and in English.
The notes (hand-written notes in Russian) will appear here:

### Resources:

- 1. Inversion:
- Animation demonstrating Inversion in circles, by Malin Christersson.
- Lipkin's Inversor, on Mathematical Etudes.

- 2. Different types of infinities:
- Where is more?, by Sergei Tabachnikov.

- 4. Spherical Geometry:
- Spherical Droste video, 2-minute video by Henry Segerman.

- 5. Hyperbolic Geometry:
- Make hyperbolic tilings of images, by Malin Christersson.

The notes (hand-written notes in Russian) from Autumn 2022:

### Resources:

- Pythagorean spiral on Wikipedia
- Unterweisung der Messung by Albrecht Durer

### Textbook:

- Geometry textbook by O. V. Pogorelov: in Ukranian and in Russian.