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

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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.

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