In geometry, a rod is a 3-dimensional, solid (filled) cylinder. Geometry ( Greek γεωμετρία; geo = earth metria = measure is a part of Mathematics concerned with questions of size shape and relative position In mathematics the dimension of a Space is roughly defined as the minimum number of Coordinates needed to specify every point within it A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. A cylinder is one of the most basic curvilinear geometric shapes the Surface formed by the points at a fixed distance from a given Straight line, the axis