A stack of quarters could be used in an informal argument for the formula for the volume of a cylinder.
Here's why:
Quarters are cylindrical in shape, and a stack of them forms a cylinder. The volume of a cylinder is calculated using the formula \( V = \pi r^2 h \), where \( r \) is the radius of the base (the radius of a quarter), and \( h \) is the height (the thickness of the stack of quarters).
The other options (sphere, cone, pyramid) do not directly relate to the shape of a stack of quarters.
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