https://en.wikipedia.org/wiki/Geometry https://en.wikipedia.org/wiki/Angle https://en.wikipedia.org/wiki/Euclidean_plane https://en.wikipedia.org/wiki/Line_(geometry) https://en.wikipedia.org/wiki/Point_(geometry) https://en.wikipedia.org/wiki/Edge_(geometry) https://en.wikipedia.org/wiki/Line_segment https://en.wikipedia.org/wiki/Regular_polygon https://en.wikipedia.org/wiki/Polygon https://en.wikipedia.org/wiki/Degenerate_conic https://en.wikipedia.org/wiki/Ellipse