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    plAne And CuRved SuRfACeS

                    The part of an object which we see, touch and feel is known as the Surface. A surface
                    can be plane (or flat) or curved.

                        1.  Some objects have only a plane surface.

                        2. Some objects have only a curved surface.

                        3. Some objects have both plane and curved surfaces.

                    faces, edges and Corners of a Solid

                        l  face: The surface of a solid shape is made up of faces.
                           The face of a solid could be plane or curved.

                        l  edge: The line where two faces meet is called an edge.
                           The edge of a solid could be straight or curved.
                        l  Corner:  The point  where three  edges  meet  is  called  a

                           corner or vertex.

                    Cube

                        l  A cube has 6 plane faces having the same shape and size.

                        l  It has 8 corners or vertices.
                        l  It has 12 edges. All the edges are straight and of the
                           same length.

                    Cuboid
                        l  A cuboid  has 6 plane faces but  all  are not the same
                           shape and size. The opposite faces of a cuboid are the

                           same shape and size.

                        l  It has 8 corners.
                        l  It has 12 edges (straight) but all are not equal. The opposite edges are equal.

                    difference between a cube and a cuboid

                        l  In a cuboid, the opposite faces are the same shape and size. In a cube, all the
                           faces are the same shape and size.

                        l  In a  cube,  all the  edges  are  equal, whereas in  a  cuboid,  the  edges  can  be
                           different sizes.

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                                                                                                    Geometry

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