Quadrilateral. In Euclidean plane geometry, a quadrilateral is a polygon with four sides (or 'edges') and four vertices or corners. Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided), hexagon (6-sided) and so on.
Some environmental scientists and specialists focus on environmental regulations that are designed to protect peopleâs health, while others focus on regulations designed to minimize societyâs impact on the ecosystem.
Whatever your focus, you'll work to solve some of the most serious problems facing the world today. Environmental scientists use ideas from the life and physical sciences to protect natural resources, such as forests and water. Environmental scientists use computers to study data and create maps.