definition column) in the blank column, Object Answer | Definition Regular A) A perfectly rounded solid in three dimensional space polygon 2 Platonic solid B) Identical circular ends that are flat and parallel to each other 3 Polyhedron C) A 3D solid that consists of a polygon as a base and all the side faces meet at a single vertex. Face D) A shape where all sides are of equal length and all angles are equal in size 5 Edge E) Two faces meet in a straight line segment Vertices F) A solid in which every face is a polygon Pyramid G) The flat plane surface on a polyhedron Cylinder H) A solid in which all faces are regular polygons and the same number of faces meet at each vertex. Sphere I) A corner where a number of edges and faces meet [9] Mathematics Grade 9