Geometry

Geometry (from the Ancient Greek: γεωμετρία; geo- "earth", -metron "measurement") is a branch of mathematics concerned with questions of shape, size, relative position of figures, and the properties of space. A mathematician who works in the field of geometry is called a geometer.

Geometry arose independently in a number of early cultures as a practical way for dealing with lengths, areas, and volumes. Geometry began to see elements of formal mathematical science emerging in the West as early as the 6th century BC. By the 3rd century BC, geometry was put into an axiomatic form by Euclid, whose
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Flatland: A Romance of Many Dimensions
The Greedy Triangle (Brainy Day Books)
Sir Cumference and the First Round Table: A Math Adventure (Sir Cumference, #1)
Euclid's Elements
Geometry and the Imagination
Geometry Revisited
Euclid's Window: The Story of Geometry from Parallel Lines to Hyperspace
The First Six Books of the Elements of Euclid
Sacred Geometry: Philosophy and Practice
Introduction to Geometry (Wiley Classics Library)
Geometry: A Comprehensive Course (Dover Books on Mathematics)
Sacred Geometry (Wooden Books, 35)
Geometry: Euclid and Beyond (Undergraduate Texts in Mathematics)
Algebraic Geometry (Graduate Texts in Mathematics, 52)
The Geometry of Physics: An Introduction

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Rudolf Steiner
Wir Theoso­phen wollen die andern gern verstehen; und wir können war­ten, bis sie uns Gleiches mit Gleichem vergelten werden. Sollte ich mein mathematisch-nüchternes Denken, und meine Spinoza-Verehrung verleugnen müssen, weil ich Theosoph bin, wahrlich ich wäre es in einer Stunde nicht mehr. Da ich aber Theosoph geworden bin, weil ich einstmals zwischen den Vorlesungen über «Integration linearer Differentialglei­chungen», synthetischer Geometrie und deskriptiver Geome­trie wirklich habe mathemat ...more
Rudolf Steiner

In the pentagram, the Pythagoreans found all proportions well-known in antiquity: arithmetic, geometric, harmonic, and also the well-known golden proportion, or the golden ratio. ... Probably owing to the perfect form and the wealth of mathematical forms, the pentagram was chosen by the Pythagoreans as their secret symbol and a symbol of health. - Alexander Voloshinov [As quoted in Stakhov]
Alexey Stakhov, MATHEMATICS OF HARMONY: FROM EUCLID TO CONTEMPORARY MATHEMATICS AND COMPUTER SCIENCE

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