The parallel sides are called the bases of the trapezoid and the other two sides are called the legs or the lateral sides (if they are not parallel; otherwise there are two pairs of bases). A scalene trapezoid is a trapezoid with no sides of equal measure, in contrast to the special cases below.
It was designed and built by the Wright brothers. They flew it four times on December 17, 1903, near Kill Devil Hills, about four miles south of Kitty Hawk, North Carolina, US. Today, the airplane is exhibited in the National Air and Space Museum in Washington D.C.
Wright brothers finish work on a 1905 machine and begin making flights in it at Huffman Prairie. Orville Wright pictured here turning to the left in the last photographed flight (No. 46) of 1905; Huffman Prairie, Dayton, Ohio. From the collections of the Library of Congress.