# CBSE Class 7 Maths Revision Notes Chapter 15

## CBSE Class 7 Mathematics Chapter 15 Revision Notes – Visualising Solid Shapes

To make the chapter “Visualising Solid Shapes” easier for students to revise, the Class 7 Mathematics Chapter 15 Notes have been specially designed. The notes will help the students understand the basic as well as advanced concepts of the “Visualising Solid Shapes” chapter in a better way.

To consolidate their learning, the students can rely on the Class 7 Mathematics Chapter 15 Revision Notes. The revision notes have been prepared based on the CBSE guidelines and prescribed syllabus. Extramarks recommends that the students regularly revise the Class 7 Mathematics Chapter 15 Revision Notes.

Class 7 Mathematics Chapter 15 Notes cover important topics of the chapter like dimensions of 1D and 2D figures, shapes, and different views of a solid shape. Students can read these notes to know more about various solid shapes like cubes, cuboids, cylinders, spheres, and cones.

### Access Class 7 Mathematics Chapter 15 – Visualising Solid Shapes Notes in 30 Minutes

Plane Figures

Plane figures refer to those figures that are flat as well as 2 dimensions. They do not have any thickness. For example, triangles, circles, rectangles, squares, etc.

Solid Shapes

Solid Shapes are those shapes that are 3 dimensional. They have volume and occupy space. For example, hemisphere, cone, sphere, cuboid, cube, etc.

3D Shapes

A 3D shape is 3-dimensional and is not flat. A 3D shape has vertices, edges, and faces.

Faces

Face refers to the flat surface of a 3D shape. For example, a cube has 6 faces.

Edges

A line segment which connects one vertex to another vertex is called edge.

For example, a cylinder has 2 edges.

Vertices

Vertices are certain points in a 3D shape wherein the edges connect between the faces.

Drawing Solids on a Flat Surface

Oblique sketches and isometric sketches are two ways of drawing solids on a flat surface. Let us read more and know about them in detail.

Oblique Sketches

• Oblique sketch aids in representing 3D objects easily in a pictorial format.
• These sketches are drawn on plain paper to showcase the perspective of a 3D object.
• There is no measurement mentioned with respect to a 3D object.

Isometric Sketches

• There are specific isometric sheets on which isometric sketches are made.
• These are also pictorial representations of 3D objects.

Viewing Different Sections of a Solid

The following are ways for viewing different sections of a solid.

Shadow casting is done to get a 2D view of a 3D object.

• Slicing and cutting

Slicing and cutting aid in getting a cross-sectional view of a solid.

• Viewing solid from different angles

There are different views for viewing the solid from different angles. They include top view, side view, and front view.

### 1. Which are the important topics in Class 7 Mathematics Chapter 15?

The students should focus on the following topics in the chapter.

• Dimensions: 1D and 2D figures
• Shapes
• Different views of a solid shape
• Cube, Cuboid, Cylinder, Sphere, Cone

### 2. What is the face of the surface?

Faces are flat surfaces on solid objects. There can be more than one face on a solid shape. Solids are made up of polygonal regions called faces.

### 3. Is it possible to draw a 3D figure on a flat surface?

Solid figures on flat surfaces can be drawn in two ways. Visual illusion is a method that is essential for visualising solid forms and visualising solid shapes.

### 4. What are three-dimensional shapes?

Three-dimensional forms, called solid figures, are another important topic for the chapter on Visualising Solid Shapes. Solid figures typically have three dimensions: length, height, and breadth. These figures are tactile and cannot be drawn on flat surfaces.