its the overall space the object takes up....So technically yes its the inside....To find it on a box its Length x Width x Height
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That gives the volume, not surface area.
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Surface area is all the areas for a 3 figure. Area is for only on side of a 3d figure
That depends on the figure whose surface area and volume you're finding. You could try a Google search for "volume of [figure name]" or "surface area of [figure name]".
A 2D interior will be length times width (a flat shape) as in the area of a floor.A 3D figure would be length times width times depth (a raised shape) as in a box.The units used would depend. A floor would be in feet and inches or metres and centimetres.A 3D figure would be in a similar measurement, but given in cubic units.
Area is the number of square units contained in the interior of a figure
The "Surface Area" of the solid figure. Note, the word "total" in the answer above is not correct/needed - there can not be anything less than a surface area of a solid figure.