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

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
The Copy and Apply Formatting dialog box, located under the Format > Copy and Apply menu

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