Euclidean geometry is the linear based geometry that was developed by the Greek geometer Euclid a little over two millennia ago, the propositions of which were published in his work The Elements.” {source}

One way to think of the Euclidean plane is as a set of points satisfying certain relationships, expressible in terms of distance and angles.

Another way is rotation around a fixed point in the plane, in which all points in the plane turn around that fixed point through the same angle.

One of the basic tenets of Euclidean geometry is that two figures (usually considered as subsets) of the plane should be considered equivalent (congruent) if one can be transformed into the other by some sequence of translations, rotations and reflections.

Euclid is considered to be “the father of geometry.”