1 This implies that the other two sides are of equal length, and that the diagonals are of equal length. 2  An alternative definition is: a quadrilateral with an axis of symmetry bisecting one pair of opposite sides. 3  Trapezium (NAm.): no sides are parallel.
An enumeration date commonly refers to the official or control date set for a particular enumeration event such as a census. The official enumeration date may vary from one enumeration to the next. The enumeration date is a control function for collecting data over a broad space of time. All data collected is based on its validity as of a single date, no matter what date the information is taken within the enumeration period.
In the section above, it was said that the date portion of a serial date-time represents the number of days since 1900-Jan-0. This is true, but Excel can also treat the date portion of a serial date as the number of days since 1904-Jan-0.This mode is, called the 1904-mode or 1904-system, is used for compatibility with the Macintosh system. The date mode applies to all dates within a workbook. You cannot mix and match modes within a workbook.n the section above, it was said that the date portion of a serial date-time represents the number of days since 1900-Jan-0. This is true, but Excel can also treat the date portion of a serial date as the number of days since 1904-Jan-0.