![]() A right prism is called a right triangular prism if its ends are triangles. Prism is called a triangular prism if its ends are a triangle. Otherwise, it is said to be an oblique prism. Right PrismĪ prism is called a right prism if its lateral edges are perpendicular to its ends (bases). AA’, BB’, CC’, DD’ and EE’ are the lateral edges of the prism.Ī prism is called a regular prism if its ends are a regular polygon. Lateral edges: The lines of intersection of the lateral faces of a prism are called the lateral edges of the prism.In fig., ABB’A’, BCC’B’, CDD’C’, etc are lateral faces. Lateral faces: All faces other than the basis of a prism are known as its lateral faces.Length of prism: A length of a prism is a portion of the axis that lies between the parallel ends.a straight line passing through O’ and O is the axis of the prism. Axis of prism: The straight line joining the centres of the ends of the prism is called the axis of the prism.So it is the height of the prism shown in fig. In fig B’F is the perpendicular distance between the ends ABCDE and A’B’C’D’E’. The Height of a Prism: The perpendicular distance between the ends of a prism is called the height of the prism.In fig ABCDE and A’B’C’D’E’ are the bases of the prism. The Base of a Prism: The end on which a prism may be supposed to stand is called the base of the prism.In fig, there is a prism whose bases are rectilinear figures ABCDE and A’B’C’D’E’. PrismĪ prism is a solid, whose side faces are parallelograms and whose bases are congruent parallel rectilinear figures. So, let us know more about these two polyhedrons. Two important members of polyhedron family are prism and pyramid. Otherwise, it is known as the concave polyhedron. If the line segment joining any two points on the surfaces of a polyhedron entirely lies inside or on the polyhedron, then it is said to be a convex polyhedron. ![]() Clearly, 3 faces meet at A but 4 faces meet at B. It is not regular because its faces are congruent triangles but the vertices are not formed by the same number of faces. ![]() A cube is a regular polyhedron but a cuboid is not a regular polyhedron as its faces are not congruent rectangles. This means that the faces of a regular polyhedron are congruent regular polygons and its vertices are formed by the same number of faces. Following are some example of polyhedrons:Ī polyhedron is said to be a regular polyhedron if its faces are made up of regular polygons and the same number of faces meet at each vertex. In a polyhedron, three or more edges meet at a point to form a vertex. You can download Visualising Solid Shapes Cheat Sheet by clicking on the download button below
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