- The circle, the square, the rectangle, the quadrilateral and the triangle are examples of plane figures; the cube, the cuboid, the sphere, the cylinder, the cone and the pyramid are examples of solid shapes.
- Plane figures are of two-dimensions (2-D) and the solid shapes are of three-dimensions (3-D).
- The corners of a solid shape are called its vertices; the line segments of its skeleton are its edges; and its flat surfaces are its faces.
- A net is a skeleton-outline of a solid that can be folded to make it. The same solid can have several types of nets.
- Solid shapes can be drawn on a flat surface (like paper) realistically. We call this 2-D representation of a 3-D solid.
- Two types of sketches of a solid are possible:
(a) An oblique sketch does not have proportional lengths. Still it conveys all important aspects of the appearance of the solid.
(b) An isometric sketch is drawn on an isometric dot paper, a sample of which is given at the end of this book. In an isometric sketch of the solid the measurements kept proportional.
- Visualising solid shapes is a very useful skill. You should be able to see ‘hidden’ parts of the solid shape.
- Different sections of a solid can be viewed in many ways:
(a) One way is to view by cutting or slicing the shape, which would result in the cross-section of the solid.
(b) Another way is by observing a 2-D shadow of a 3-D shape.
(c) A third way is to look at the shape from different angles; the front-view, the side-view and the top view can provide a lot of information about the shape observed.
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CBSE Class–VII |
CHAPTER – 1 Integers | NMMS Revision Notes à
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Tracing Changes Through a Thousand Years | NMMS Revision
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New Kings and Kingdoms | NMMS Revision Notes | Class 7 |
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The Delhi Sultanate | NMMS Revision Notes | Class 7
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The Mughal Empire | NMMS Revision Notes | Class 7 Social à Click Here
Tribes Nomads and Settled Communities | NMMS Revision
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Devotional Paths to the Divine | NMMS Revision Notes |
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The Making of Regional Cultures | NMMS Revision Notes |
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Eighteenth Century Political Formations | NMMS Revision
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Environment | NMMS Revision Notes | Class 7 Social à Click
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Inside Our Earth | NMMS Revision Notes | Class 7 Social à Click Here
Our Changing Earth | NMMS Revision Notes | Class 7 Social
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Air | NMMS Revision Notes | Class 7 Social à
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Water | NMMS Revision Notes | Class 7 Social à Click Here
Human Environment Interactions the Tropical | NMMS
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Life in the Deserts | NMMS Revision Notes | Class 7
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On Equality | NMMS Revision Notes | Class 7 Social à Click Here
How the State Government Works | NMMS Revision Notes |
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Role of the Government in Health | NMMS Revision Notes |
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Growing up as Boys and Girls | NMMS Revision Notes |
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Women Change the World | NMMS Revision Notes | Class 7
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Understanding Media | NMMS Revision Notes | Class 7
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Markets Around Us | NMMS Revision Notes | Class 7 Social à Click Here
A Shirt in the Market | NMMS Revision Notes | Class 7
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Nutrition in Plants | NMMS Revision Notes | Class 7
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Nutrition in Animals | NMMS Revision Notes | Class 7
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Heat | NMMS Revision Notes | Class 7 Science à Click
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Acids Bases And Salts | NMMS Revision Notes | Class 7
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Physical And Chemical Changes | NMMS Revision Notes |
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Respiration In Organisms | NMMS
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Transportation in Animals and
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Force and Pressure | NMMS
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Reproduction In Plants | NMMS
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Motion And Time | NMMS Revision
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Electric Current and its
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Light | NMMS Revision Notes |
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Waste Water Story | NMMS Revision Notes | Class 7 Science
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How When and Where | NMMS Revision Notes | Class 8 Social
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From Trade to Territory | NMMS Revision Notes | Class 8
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Ruling the Countryside | NMMS Revision Notes | Class 8
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Tribals Dikus and Vision of Golden Age | NMMS Revision
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When People Rebel | NMMS Revision Notes | Class 8 Social à Click Here
Weavers Iron Smelters and Factory Owners | NMMS Revision
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Civilising the Native Educating the Nation | NMMS
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Women Caste and Reform | NMMS Revision Notes | Class 8
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