Class 7 Mathematics
Chapter 15: Visualising Solid Shapes
STAGE 0: Foundation
In daily life, we see many objects that have length, breadth, and height. Such objects are called solid shapes.
Examples:
- Dice
- Ball
- Book
- Box
STAGE 1: 2D and 3D Shapes
2D shapes have only length and breadth.
Examples: Square, Rectangle, Triangle, Circle
3D shapes have length, breadth, and height.
Examples: Cube, Cuboid, Sphere, Cylinder
STAGE 2: Faces, Edges, and Vertices
Face: Flat surface of a solid shape
Edge: Line where two faces meet
Vertex: Corner point
Example: Cube
- Faces = 6
- Edges = 12
- Vertices = 8
STAGE 3: Nets of Solid Shapes
A net is a flat shape which can be folded to form a solid.
Examples:
- Net of cube → 6 squares
- Net of cuboid → 6 rectangles
STAGE 4: Different Views of Objects
A solid object looks different from different sides.
- Top view
- Side view
- Front view
Example: A cube looks like a square from all views.
STAGE 5: Map and Plan
A map is a drawing of a place seen from the top.
A plan shows how something looks from above.
Example: Classroom seating plan.
STAGE 6: Solved Examples
Example 1:
How many faces does a cuboid have?
A cuboid has 6 faces.
Example 2:
Name a solid shape with no edges.
A sphere has no edges.
STAGE 7: Practice Questions
1. Name any two 3D shapes.
2. How many edges does a cube have?
3. What is a net?
4. Which solid shape has only one curved surface?
5. Draw the net of a cube.
Shaktimatha CBSE Learning
Class 7 Mathematics – Chapter 15: Visualising Solid Shapes
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