Parallelogram Parallelogram In Euclidean geometry, a parallelogram is a simple (non-self-intersecting) quadrilateral with two pairs of parallel sides. The opposite or facing sides of a parallelogram are of equal length and the opposite angles of a parallelogram are of equal measure. The congruence of opposite sides and opposite angles is a direct consequence of the Euclidean parallel postulate and neither condition can be proven without appealing to the Euclidean parallel postulate or one of its equivalent formulations. By comparison, a quadrilateral with just one pair of parallel sides is a trapezoid in American English or a trapezium in British English. The
I Just Don't Know What to Do with Myself would remain Springfield's only UK solo hit to chart higher than "I Just Don't Know...". A concurrent US release of Springfield's "I Just Don't Know What to Do with Myself" was preempted by the presence of Springfield's "Wishin' and Hopin'" in the US Top Ten over the summer of 1964. Springfield's "I Just Don't Know..." received a belated US release in October 1965 featured on a single with Springfield's current UK hit "Some of Your Lovin'"; that month Springfield made a promotional junket to the US which included performances of both of the single's tracks on the TV shows "Hullabaloo"