CBSE Class 7 Maths Revision Notes Chapter 15

Class 7 Mathematics Chapter 15 Revision Notes

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.

Revision Notes for CBSE Class 7 Maths Chapter 15

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

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.

FAQs (Frequently Asked Questions)

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.