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The answer depends on what information you do have about the pyramid.
You have to find out the area of the base which you find out with perpendicular height times base then time that by the perpendicular height of the pyramid and divide it by 3
Your roof is a square based pyramid.
Volume of a pyramid = 1/3*base area*height
There are quite a few ways you could find the height of a square pyramid. You could measure the sides for example.