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The surface area of a pyramid is the area of all the faces of the pyramid, for a pyramid with apex in the centre and a regular polygon as its base, (the bottom of a pyramid is the base, it is regular if all sides are the same length) the surface area is: B + 1/2(P * H) where B is the area of the base, P is the perimeter (area around) the base and H is the height of the pyramid.
The volume of a regular pyramid with a square base of 8cm and a slant height of 5 cm is: 64 cm3
An oblique pyramid is either one whose base is not a regular polygon or one whose apex is not vertically above the centre of its base.
In general, an octagonal pyramid is a pyramid with an octagon for a base and triangles (which all have a common vertex) for sides. The octagon my or may not be a regular one.