I am trying to create a circle (ie. color specific cells in a spreadsheet)
based on a certain diameter (ie. 100 cells). This could be code (formula)
written in Visual Basic that would use the given diameter and automatically
selects cells to leave out of the circle (different color). I was wondering
if this is some way that has already been implemented previously or if there
is a formula (circle equation I believe, R^2 = X^2 + Y^2) that I could use in
VB and automatically apply it to spreadsheet cells and only color the cells
that would form a circle and leave other cells as is?

Your help is very much appreciated.