Silicon is a member of Group 14 (IVA) in the periodic table. The periodic table is a chart that shows how chemical elements are related to one another. Silicon is also part of the the carbon family. Other carbon family elements include carbon, germanium, tin, and lead. Silicon is a metalloid, one of only a very few elements that have characteristics of both metals and non-metals. Silicon is the second most abundant element in the Earth's crust, exceeded only by oxygen. Many rocks and minerals contain silicon.
circumscribe meaning, definition, what is circumscribe: to limit something: . Learn more.
A radius of a circumscribed circle is a radius of a regular polygon, a radius of a inscribed circle is its apothem. For the most of regular polygons it is impossible to express the relation between their sides and radii by an algebraic formula. E x a m p l e .