Skip to main content


What's in a word

Etymology: The Indo-European root ank- or ang-, 'to bend' gives rise to various words referring to bent or bendable things, including ankle, and England (Angle-land, Anglia, from the shape of the original homeland, the Angul district of Schleswig, of the people who came to be known as the "Angles.")

Other related words: ankle, angle (in the fishing sense, from the obsolete use to mean 'fishhook'), England, anchor.

Mathematical ideas

Sum of interior angles in a quadrilateral

Related mathematical terms

Triangle, Rectangle, Equiangular