Category : 7th Class
SOLID SHAPES
FUNDAMENTALS
(a) Square
It has four sides and four comers, All its sides are of the same length.
(b) Rectangle.
It has four sides and four comers. The opposite sides of a rectangle are parallel and of the same length. Every interior angle is a right \[\angle le\].
(c) Triangle
It has three sides and three vertices.
(d) Cuboid
It has 6 flat faces, 12 straight edges and 8 vertices.
(e) Cube
It has 6 flat faces, 8 vertices and 12 straight edges.
(f) Cylinder
It has 3 faces s\[\to \]1 curved face and 2 flat faces.
(g) Cone
It has 2 faces \[\to \] 1 curved face and 1 flat face.
It has 1 curved edge.
(a) An oblique sketch which does not have proportional faces but gives a realistic feel of the 3D solid.
e.g.. Oblique sketch of a cuboid.
(b) An isometric sketch, drawn on an isometric dot paper, which has proportional measurements of the solid.
(a) Slicing the shape results in the cross  section of the solid.
(b) Observing a 2  D shadow of a 3  D shape.
(c) Looking at the shape from different angles, i.e., the frontview, the sideview and the topview.
Front and top view of a cylinder
S. No. 
Name of the figure 
Figure 
Description 
Components 
1. 
Triangular prism 

A triangular prism a kaleidoscope. It has triangular bases 
Faces: 5 Edges : 9 Vertices: 6 
2. 
Triangular pyramid or Tetrahedron 

It has a triangular base. 
Face : 4 Edges: 6 Vertices: 4 
3. 
Square Pyramid 

It has a square as its base

Faces: 5 Edges: 8 Vertices : 5 
4. 
Sphere 

No flat face, It has only a spherical face. 
Faces: 1 Edges: 0 Vertices : 0 
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