www.britannica.com/science/Euclidean-geometry

Euclidean geometry, the study of plane and solid figures on the basis of axioms and theorems employed by the Greek mathematician Euclid (c. 300 bce).In its rough outline, Euclidean geometry is the plane and solid geometry commonly taught in secondary schools. Indeed, until the second half of the 19th century, when non-Euclidean geometries attracted the attention of mathematicians, geometry ...

en.wikipedia.org/wiki/Euclidean_geometry

Euclidean geometry is a mathematical system attributed to Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements.Euclid's method consists in assuming a small set of intuitively appealing axioms, and deducing many other propositions from these.Although many of Euclid's results had been stated by earlier mathematicians, Euclid was the first to sh...

www.khanacademy.org/math/geometry

Roughly 2400 years ago, Euclid of Alexandria wrote Elements which served as the world's geometry textbook until recently. Studied by Abraham Lincoln in order to sharpen his mind and truly appreciate mathematical deduction, it is still the basis of what we consider a first year course in geometry.

physicscatalyst.com/Class9/euclid-geometry.php

Euclid Geometry. The word 'geometry' comes form the Greek words 'geo', meaning the 'earth', and 'metrein', meaning 'to measure; Euclid a Greek mathematician is called the Father of Geometry; Euclid collected all the known work in his time and created Elements .He divided the 'Elements' into thirteen chapters, each called a book.

www.mathcentre.ac.uk/resources/uploaded/euclidean-geometry-october-final.pdf

The adjective “Euclidean” is supposed to conjure up an attitude or outlook rather than anything more specific: the course is not a course on the Elements but a wide-ranging and (we hope) interesting introduction to a selection of topics in synthetic plane geometry, with the construction of

explorable.com/euclid

Euclid's Axioms. Euclid based his approach upon 10 axioms, statements that could be accepted as truths. He called these axioms his 'postulates' and divided them into two groups of five, the first set common to all mathematics, the second specific to geometry.

www.britannica.com/science/non-Euclidean-geometry

Non-Euclidean geometry, literally any geometry that is not the same as Euclidean geometry. Although the term is frequently used to refer only to hyperbolic geometry, common usage includes those few geometries (hyperbolic and spherical) that differ from but are very close to Euclidean geometry (see

farside.ph.utexas.edu/Books/Euclid/Elements.pdf

Euclid’s Elements is by far the most famous mathematical work of classical antiquity, and also has the distinction of being the world’s oldest continuously used mathematical textbook. Little is known about the author, beyond the fact that he lived in Alexandria around 300 BCE. The main subjects of the work are geometry, proportion, and

www.siyavula.com/read/maths/grade-11/euclidean-geometry/08-euclidean-geometry-02

8.2 Circle geometry (EMBJ9). Terminology. The following terms are regularly used when referring to circles: Arc — a portion of the circumference of a circle.; Chord — a straight line joining the ends of an arc.; Circumference — the perimeter or boundary line of a circle.; Radius (\(r\)) — any straight line from the centre of the circle to a point on the circumference.

en.wikipedia.org/wiki/Euclidean_distance

Illustration for n=3, repeated application of the Pythagorean theorem yields the formula In mathematics, the Euclidean distance or Euclidean metric is the "ordinary" straight-line distance between two points in Euclidean space. With this distance, Euclidean space becomes a metric space. The associated norm is called the Euclidean norm. Older literature refers to the metric as the Pythago...