In taxicab geometry, the perpendicular bisector and the circle are defined in the same way as in

Euclidean geometry, but they look quite different.

If space is curved then

Euclidean geometry, which is one of many axiomatic systems, does not apply.

In

Euclidean geometry there are right angled triangles and equilateral triangles, but in topology all triangles are the same.

Ambition can be personally challenging, even disastrous or tragic--think of the costs of hubris which the same ancient Greeks knew so well--but it has given us, to pick more or less at random, Thermopylae,

Euclidean geometry, Angkor Wat, the Goldberg Variations, Laphroaig single malt, the Critique of Pure Reason, penicillin, Four Quartets, abstract expressionism, Batman, and the Empire State Building, not to mention the Die Hard movie franchise.

1040) on the foundations of

Euclidean geometry, leading him in the process to prove theorems in non-

Euclidean geometry, including a formulation of what is today called the Strong Hilbert Axiom of Parallels.

Before hyperbolic geometry was discovered, it was thought to be completely obvious that

Euclidean geometry correctly described physical space, and attempts were even made, by Kant and others, to show that this was necessarily true.

Although Einstein didn't excel in high school in Munich, he had already begun educating himself on

Euclidean geometry, deductive reasoning and calculus using textbooks borrowed from a family friend.

Ordinary

Euclidean geometry is an example of an infinite Affine geometry since the two axioms are valid in the plane.

Alys's artistic affinity with the Situationist International and neo-dada movements like Fluxus manifests itself in his efforts to conjure an experiential map for the city through arbitrary social encounters, which transcend the confining

Euclidean geometry of modern urban planning.

In mathematics,

Euclidean geometry used to be taught in something close to its original presentation two thousand years ago as a rational progression of ideas.

175, 176): "In his 1926-27 lectures at the University of Warsaw, Alfred Tarski gave an axiomatic development of elementary

Euclidean geometry.

For dissimilarities the geometry is contained in the definition, giving the possibility to include physical background knowledge; in contrast to feature-based representations which usually suppose a

Euclidean geometry.