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like the room has length, breadth as well as height of the room is a 3D shapes, book, box, pencil, pots all are

the example of 3D shapes.

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other faces are triangles whose bases are the sides of the polygon and which meet at a common point

outside the plane of the polygon.

The plane face which is a polygon, is called the base of the pyramid and the triangular faces are its lateral

faces. The common point at which the lateral faces meet is called its vertex. The straight line in which

adjacent faces intersect called the edges (or lateral edges) of the pyramid. The perpendicular distance from

the vertex to the plane of the base is called the height (or altitude) of the pyramid.

The area of the slant surface of the right pyramid= (1/2 ) x perimeter of the base x slant height

· Area of the whole surface of the right pyramid =area of its slant surface + the area of its base.

· Volume of the right pyramid= (1/3) x area of the base x height.

plane polygon and other called the side faces.