A circular disc ( like a nickel ) would have three surfaces.
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3*pi*r2
increase the surface area of a solid means to increase the area of solid
A a solid figure on a flat surface is a plane figure (I do believe)
It will increase it, as more of the outer surface of the solid is incontact with the liquid that it is dissolving in. :)
It is a face of the 3-d figure.