How do I find the Volume of a Pyramid?

I am in Calc 3, and my teacher gave me this problem m=vd, where the density is 2.7 g/cc, and the square base is 230.33m and the height is 146.59 m and he asked us to find the volume. He should us how to do it on a sphare but I am really confused as what to do. He also mentioned cutting it in half and trying to find the volume like that then doubling it in the end, but I have know clue how even to get start with this, please help if you know this stuff!