Mensuration : - ( Volume and Surface area of truncated solid square based pyramid ) - 27.

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Mensuration is a branch of mathematics that deals with measurement of various parameters of geometric figures.
Volume : is the quantity of three dimensional space enclosed by some closed boundary .
Surface area : of a solid object is measure of the total area that the surface of the object occupies.
Volume of combined figures is the sum of individual volumes and surface area of combined figures is the sum of surface area of individual figures minus the common surface of combination.
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18.2^2 - 7root2^2 or just 7^2 ??
I think you are mixing things here. Use the diagonal if you are to use the slant edge

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