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.
Environmental Toxicology. Environmental toxicology is a good area of study for science majors who are interested in pollutants and their effect on the physical environment. Read on to discover academic and career options in this interdisciplinary science that examines how toxins affect human health and other life forms.