MS Excel
A circular reference is

Geometric modeling tool
A cell that points to a drawing object
A formula that either directly or indirectly depends on itself
Always erroneous

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MS Excel
How do you insert a row?

Select the row heading where you want to insert the new row and click the Insert Row button on the standard toolbar
Right-click the row heading where you want to insert the new row and select Insert from the shortcut menu
All of the listed here
Select the row heading where you want to insert the new row and select Edit >Row from the menu

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MS Excel
You can edit a cell by

Selecting Edit > Edit cell from the menu
None of these
Clicking the formula button
Double clicking the cell to edit it in place

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