The Indo-European root (s)kel- "curved, bent" is found in scoliosis and colon, borrowed from Greek. Isosceles (adjective): from Greek isos "equal", of unknown prior origin, and skelos "leg". A scalene cone or cylinder is one whose axis is not perpendicular to its base opposite elements make "uneven" angles with the base. The scalene muscles on each side of a person's neck are named for their triangular appearance. A scalene triangle is uneven in the sense that all three sides are of different lengths. Scalene (adjective): from the Indo-European root skel- "to cut." Greek skalenos originally meant "stirred up, hoed up." When a piece of ground is stirred up, the surface becomes "uneven," which was a later meaning of skalenos. The first two are of Greek (and related) origins the word "equilateral" is of Latin origin: Schwartzman's The Words of Mathematics explain the etymology (the origins) of the words. A triangle with all three equal sides is called equilateral. If two of its sides are equal, a triangle is called isosceles. If you want to see the applet work, visit Sun's website at, download and install Java VM and enjoy the applet.Ī triangle is scalene if all of its three sides are different (in which case, the three angles are also different). This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Equilateral (all three sides are equal)Īnd as regard their angles, triangles may be.Triangles are classified depending on relative sizes of their elements. The basic elements of any triangle are its sides and angles.
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