It has to do with the surface area formula:
To find the total surface area of a pyramid, use this equation:
Surface Area = B + 1/2 * P * s
B = base area
P = perimeter of the base
s = slant height
To find the volume of a Pyramid, substitute into this equation:
V=1/3Bh
B=base area
h=height of pyramid
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Volume = 1/3 height of pyramid multiplied by the area of the triangular base. V = 1/3 h * area of base.
from a pyramid
The answer depends on the what characteristic of the pyramid you want the formula for: its surface area, its volume or something else.
You need some information about the height of the pyramid and the formula will depend on whether you have the vertical height or the slant height or the length of a lateral edge.
The general formula for any type of pyramid - as well as for cones - is (1/3)Bh, where "B" is the base area, and "h" is the perpendicular height.