An interesting variation of the ordinary proof is made by placing a trapezoid T', congruent to T, in the position here shown.
The term "isosceles trapezoid" is used to mean a trapezoid with two opposite sides equal, but not parallel.
The area of a trapezoid is equal to half the sum of its bases multiplied by the altitude.
In the first drawer I keep the four plain wooden squares and two frames, one containing a rhomboid, and the other a trapezoid.
The trapezoid and the os magnum of the carpus are united, while in Choloepus they are perfectly distinct bones.
It has a rugose, tuberculated body of trapezoid form, the colors being brown and reddish, while the whole aspect is crab-like.
To find the area of a trapezoid: Multiply half the sum of the two parallel sides by the distance between them.
The second trapezoid is composed of pieces which can be placed in the rectangle, filling it completely.
trapezoid -al: a four-sided plane of which two sides are parallel and two are not.
Another drawer contains various figures: an oval, an ellipse, a rhombus, and a trapezoid.
1706, "a trapezium," from Modern Latin trapezoides, from Late Greek trapezoeides (Proclus), special use by Euclid of Greek trapezoeides "trapezium-shaped," from trapeza, literally "table" (see trapezium), + -oeides "shaped" (see -oid). Technically, a quadrilateral figure with no two sides parallel. But in English since c.1800, often confused with trapezium in its sense of "a quadrilateral figure having only two sides parallel."
trapezoid trap·e·zoid (trāp'ĭ-zoid')
n.
A quadrilateral having two parallel sides.
A small bone in the wrist situated near the base of the index finger and articulating with the second metacarpal, trapezium, capitate, and scaphoid bones.