MS Excel
A circular reference is

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

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MS Excel
To copy formatting from one area in a worksheet and apply it to another area you would use:

The Copy and Apply Formatting dialog box, located under the Format > Copy and Apply menu
There is no way to copy and apply formatting in Excel – You have to do it manually
The Format Painter button on the standard toolbar
The Edit > Copy Format and Edit>Paste Format commands form the menu

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MS Excel
You can auto fit the width of column by

Double clicking on the column left border of column header
Double clicking on column right border on column header
Double clicking on the column name on column header
Double click on the cell pointer in worksheet

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