I have already worked both out, but what I don't understand is why they (triangle and cone) have differing heights and bases.Surely they should be the same.The answers I have are: 1.5 and 3^0.5/2 for the triangle and circle.4/3 and (2*2^0.5)/3 for the cone and sphere.When the measurements of the cone are converted into the 2D plane, the triangle formed is smaller. Yet when both measurements are converted into cones, it is bigger.When I visualise it, it doesn't make sense how a triangle with a larger area spun round has a smaller volume.Could someone explain it in way that makes sense logically.Thanks.