Visualizing solid shapes

Can you see that, the two dimensional figures can be identified as the faces of the three dimensional shapes? For example a cylinder has two faces which are circles, and a pyramid, shaped like this has triangles as its faces.We will now try to see how some of these 3-D shapes can be visualised on a 2D- surface, that is, on paper.

When we slice (cut through) a 3D shape, we make a 2D shape called a cross section. In this tutorial, we think about the different cross sections we can make by slicing 3D shapes.