Answer: When a transversal cuts (or intersects) parallel lines several pairs of congruent and supplementary angles are formed. There are 3 types of angles that are congruent: Alternate Interior, Alternate Exterior and Corresponding Angles. Some people find it helpful to use the 'Z test ' for alternate interior angles. If you can draw a Z or a 'backwards z', then the alternate interior angles are the ones that are in the corners of the Z.
Recover A Deleted Worksheet Sheet Tab in Excel. You probably have discovered that when you (accidentally) delete a sheet there is no Undo option to bring it back. One solution is to close your workbook without saving the changes and then reopen it in its original state.
To reproduce: 1  Delete one column in a xls file with approximately 700,000 rows (again this is a large 300MB+ file), 2  Excel still displays the deleted column after deletion. 3  However, if you then save the file, close it, and then open the file back up again, you see that the deleted column is, in fact gone.