hypotenuseThe longest side of a right triangle – the one opposite the right angle. The word comes from the Greek roots hypo meaning "under" (which also appears, for example, in "hypodermic" – "under the skin") and tein or ten, for stretch. Thus hypotenuse is the line segment "stretched under" the right angle. See also Pythagoras' theorem. Related category GEOMETRYAlso on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History |