Solid Shapes
Category : 8th 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 \[\to \] 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 3-D 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 front-view, the side-view and the top-view.
Front and top view of a cylinder
S. No. |
Name of the figure |
Figure |
Description |
Components |
1. |
Triangular prism |
|
A triangular prism resembles 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. |
Face : 1 Edges : 0 Vertices : 0 |
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