MS Excel
A circular reference is

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

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MS Excel
How do you insert a row?

All of the listed here
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
Select the row heading where you want to insert the new row and select Edit >Row from the menu

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