I can calculate volumes, including prisms, pyramids, cones, and spheres, using formulae What I learned in this group is how to calculate the volume of spheres, cones and cylinders. I also learned how to calculate the surface area of spheres. Modelling Book What I found challenging was the Extended Abstract Task Colossal Kiwi mostly because of the paint layer question and I also found the surface area and volume of spheres IXL task mostly because it kept on switching between the two.