How do we find the volume of pyramids and cones?

Pyramids and cone unlike prisms and cylinders have only one base. Sad for them but that means that they full one- third of the figures with two faces. Which is part of the equation. V=1/3 Ab*h. So Ab is the area of the base and h is the height. So you would fin the base's area and times it by the height. The way Schatt explain is it it's because of infinity amounts of same 'papers' placed inside to fill it to the height.