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# CBSE Class 7 Maths Chapter 15 Visualising Solid Shapes Revision Notes

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## CBSE Class 7 Maths Chapter 15 Visualising Solid Shapes Revision Notes

If you are looking forward to scoring excellent marks in your Class 7 Maths Exams then it becomes very significant to understand the importance of Revision. Revision is very important as it helps you remember all the important chapters and co-related concepts that you have learned earlier and for the purpose of Revision, Revision Notes are always considered the best as they make your learning easy and convenient.

Chapter 15 of CBSE Class 7 Maths is Visualising Solid Shapes. Swiflearn offers the best and most reliable CBSE Class 7 Maths Chapter 15 Visualising Solid Shapes Revision Notes that will make students understand all the important topics & concepts of this chapter and will help them in higher studies also. Free CBSE Class 7 Maths Chapter 15 Visualising Solid Shapes Revision Notes provided here are prepared under the auspices of our Excellent Teachers keeping in mind the latest CBSE guidelines.

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## Visualising Solid Shapes

Introduction

Shapes are in the various form it can be in 2D (2 dimensional),3D (3 dimensional) or also in other shapes like a solid triangle, sphere, etc.

1 Dimensional

One-dimensional figures do not enclose any area and have only one direction.
Example

A ray or a line segment.

2 Dimensional

Two-dimensional figures have an area associated with them.
They have length and breadth or width.
They are usually plane figures, like squares, rectangles and circles.

Solid shape (3 –Dimensional Shape)

Solid shape is the shape which is in three dimensions i.e. length, breadth and height are called  3 –Dimensional Shape

#### Visualising Solid Shapes

It can be visualized in different ways. It can be formed by placing some solid shapes side by side to form a new solid shape.

Example:

A cylinder is formed by stacking up circles vertically.

Face

The surfaces of a solid shape are called as its face.

Edge

The line segment joining two vertices is called an edge

Vertex

The corners of a solid shape are called its vertices.

No. of Faces, Edges and Vertices in some common 3- D Shapes

 Sr No 3 – D Shape Faces Edges Vertex 1 Cube 6 12 8 2 Cuboid 6 12 8 3 Cylinder 3 2 0 4 Cone 2 1 1 5 Sphere 1 1 0

Drawing solids on a flat surface

Solid shapes can be represented on a 2D flat surface like paper.

This is done by drawing oblique sketches, to make it appear 3D. This is called as 2D representation of a 3D solid.

Oblique sketches

Oblique sketches do not have the exact length of a solid shape but appears exactly like the solid shape.

Example

Drawing an oblique sketch of a cube:
Step 1: Draw the front and the opposite faces.
Step 2: Join the corresponding corners.
Step 3: Redraw using dotted lines for hidden edges.