Ok what I think you mean is volume of a pyramid... but ill answer both.
Area of a triangle:
Base x height x 0.5
Volume of a pyramid:
Base area x height x 1/3
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(base area x height) / 3 is the volume. The base area is found from taping the base length and multiplying by the base width.
The formula to find the area of an octagonal pyramid is area of base plus area of sides.
The volume of a regular pyramid is 1/3*area of the base*hight
The formula for a square pyramid is one square attached to four triangles which meet at a point.There are other formulae for the surface area or for the volume.
(1/3) * (base area) * height
A pyramid with these measurements are technically impossible to construct. However if you follow the formula the surface area would be a negative amount.