If you have the area of the base and vertical height, then volume = 1/3*base area*height.
If you do not have the vertical height you may be able to calculate it if you have the slant height and the base is a well behaved polygon.
If neither, but the pyramid is made of insoluble material that is non-absorbent, you should be able to calculate its volume by measuring the volume of liquid that it displaces when it is submerged.
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Not enough information. To calculate mass, you would need volume and density (mass = volume x density).
I need the dimensions of the pyramid to be able to answer this question.
You need more information. There are many shapes which could hold the same volume, but have different (is it perimeter of the base, maybe?).
A triangle is a flat area, therefore it has a surface area, not a volume. Density is unrelated to the problem; you would need some additional information to calculate the surface area.
If you only know mass, you don't have enough information to calculate density.You also need to know the volume of the piece that has that mass.Once you have both of those numbers, the density is(Mass) divided by (Volume)of the same sample.