CBSE Class 7 Maths Revision Notes Chapter 14

CBSE Class 7 Mathematics Chapter 14 Revision Notes – Symmetry

The Class 7 Mathematics Chapter 14 Revision Notes are designed for students preparing for the final examinations. All the content is created by the experts so that candidates can practice them rightly and score well in the examinations. Candidates can rely on the CBSE revision notes as they are made according to the latest guidelines of CBSE and NCERT books. Extramarks can also provide the candidates with numerous study materials such as CBSE sample papers, CBSE previous year question papers, CBSE extra questions, etc., to prepare for the final exams.

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Access Class 7 Mathematics Chapter 14 – Symmetry Notes

The students will learn about various topics relating to symmetry like the line of symmetry, lines of symmetry for regular polygon, rotational symmetry, and line symmetry and rotational symmetry in these Class 7 Mathematics Chapter 14 Notes.

Line of Symmetry

• Symmetry is a phenomenon that can be observed in any shape. When one part of the shape coincides with another part of the shape, they are said to be symmetrical to each other.
• A line that divides a single shape into two halves is known as the line of symmetry.

Lines of Symmetry for Regular Polygon

• Regular polygons are known as those polygons that can have the length of all sides and the measurements of all angles equal.
• In regular polygons, the lines of symmetry are equal to the sides of the regular polygon.

Rotational Symmetry

• When a shape is rotated at a certain specific angle around its axis in clockwise or anticlockwise directions, and even after the rotation, if the shape is the same, then it is known as rotational symmetry.
• A point through which a shape is rotated is known as the centre of rotation.
• The angle at which the shape is rotated is known as the angle of rotation.

Line Symmetry and Rotational Symmetry

• There are certain specific shapes that have line and rotational symmetry.
• For example, a circle has an infinite type of line symmetry and can be easily rotated around its centre at any possible angle.  This means that it has rotational symmetry at any angle.
• Certain alphabets such as X, O, I, and H have both rotational as well as line symmetry.

FAQs (Frequently Asked Questions)

1. What is the centre of rotation?

The centre of rotation is known as a phenomenon in which an object rotates at a fixed point. This fixed point is known as the centre of rotation.

2. What is the angle of rotation?

The angle of rotation is defined as the angle at which an object rotates.

3. What is the line of symmetry?

The line of symmetry divides a shape into two halves.

4. How to access the practice questions for class 7 Mathematics chapter 14?

You can easily access the practice questions for Class 7 Mathematics Chapter 14 on Extramarks’ official website.

5. What is rotational symmetry?

Rotational symmetry occurs when a shape is rotated at a specific angle around its axis in either a clockwise or an anticlockwise direction but remains the same shape after the rotation.