ALL ABOUT TRiANGLE
A triangle is a polygon with three corners and three sides, one of the basic shapes in geometry . The corners, also called vertices , are zero- dimensional points while the sides connecting them, also called edges , are one-dimensional line segments . The triangle's interior is a two-dimensional region. Sometimes an arbitrary edge is chosen to be the base , in which case the opposite vertex is called the apex . In Euclidean geometry , any two points determine a unique line segment situated within a unique straight line , and any three points, when non- collinear , determine a unique triangle situated within a unique flat plane . More generally, several points in Euclidean space of arbitrary dimension determine a simplex . In non-Euclidean geometries three straight segments also determine a triangle, for instance a spherical triangle or...