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# RD Sharma Class 7 Solutions Chapter 18 - Symmetry (Ex 18.1) Exercise 18.1 - Free PDF

Last updated date: 13th Aug 2024
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## Chapter 18 - Symmetry Solutions for Exercise 18.1

Free PDF download of RD Sharma Class 7 Solutions Chapter 18 - Symmetry Exercise 18.1 solved by Expert Mathematics Teachers on Vedantu.com. All Chapter 18 - Symmetry Ex 18.1 Questions with Solutions for RD Sharma Class 7 Maths to help you to revise the complete Syllabus and Score More marks. Register for online coaching for IIT JEE (Mains & Advanced) and other engineering entrance exams.

## About RD Sharma Solutions

### Symmetry Solutions - Class 7 RD Sharma Chapter-18

Numbers, shapes, and arrangements are logically explained with Mathematics. Modern academic curricula are jam-packed with complex theories and concepts. Generally, students procrastinate Maths because they perceive it as a complicated or diplomatic subject. Consequently, they have great difficulty solving the problems in their academic textbooks. A student must work hard on particular Chapters to develop a deep understanding. For example, Class 7 of RD Sharma's Symmetry is a challenging Chapter. The concepts in this Chapter are often confusing. In order for these students to thrive in their exams, Vedantu provides them with RD Sharma Solutions Class 7 Maths Chapter 18 Solutions. Students will be guided step-by-step through the solutions to develop a deeper understanding of how to solve each problem.

The following RD Sharma Solutions for Class 7 Maths Chapter 18 Symmetry Exercise 18.1 will enable students to learn more easily. The textbook solutions we provide are written clearly so students can use them to prepare for their board exams and do well in their exams. All Chapters in the textbook are covered in the RD Sharma Solutions for Class 7. In this exercise, we will discuss the lines of symmetry. Here are some topics we will cover.

1. Definition of symmetry

2. Lines of symmetry

• Lines of symmetry of a line

• Lines of symmetry of a line segment

• Lines of symmetry of an angle

• Lines of symmetry of an isosceles triangle

• Lines of symmetry of a rhombus

• Lines of symmetry of the rectangle

• Lines of symmetry of an isosceles trapezium

• Lines of symmetry of the kite

• Lines of symmetry of an arrowhead

• Lines of symmetry of a semicircle

• Lines of symmetry of a circle

3. Lines of symmetry of some regular polygons

• Lines of symmetry of an equilateral triangle

• Lines of symmetry of a square

• Lines of symmetry of a regular pentagon

• Lines of symmetry of a regular hexagon

4. Line of symmetry and reflection

5. Rotational symmetry

6. Angle of rotation

7. Order of rotational symmetry

8. Chapter 18 Symmetry

### Preparation Tips for RD Sharma Solutions Class 7 Maths Chapter 18

• It is more important for students to concentrate on understanding the concepts and theories of their topic than memorising textbooks.

• The Chapter must be well understood by the student, as well as where and how to apply the formulas to achieve the best results.

• In order to invest their time wisely, students need to maintain a schedule that allows them to study and explore different topics.

• In order to solve the problems and understand the concepts, students must use previous year's questions.

## FAQs on RD Sharma Class 7 Solutions Chapter 18 - Symmetry (Ex 18.1) Exercise 18.1 - Free PDF

1. What are the lines of symmetry?

The world around us is often symmetrical. When a line, shape, or object reproduces itself exactly in a mirror image, we say that is symmetry. A line of symmetry can be defined as the imaginary line running through the centre of an object and dividing it into two identical halves. When divided into two or more equal parts, symmetrical figures or shapes have an identical resemblance to their other parts.

2. What are the lines of symmetry of the rhombus?

There are two symmetrical lines in a rhombus. Rhombuses are divided into two halves by their lines of symmetry, and each half is the mirror image of the other half. Rhombuses are quadrilaterals with equilateral sides and different angles. When two sides of a rhombus are parallel, and the angles opposite each other are equal, they are called parallel lines.

Rhombuses are symmetrical shapes that have two lines of symmetry. A rhombus shares both of its symmetry lines with its diagonal. Thus, the two diagonals of the rhombus form both lines of symmetry.

3. What are the lines of symmetry of an isosceles triangle?

Additionally, there are two equal sides on the interior of the triangle. Triangles with two equal sides are known as isosceles. As a result, every isosceles triangle has only one line of symmetry. A vertex may be drawn by connecting the midpoint of each side to the vertex of each other. Thus, an isosceles triangle has one line of symmetry.

4. What are the lines of symmetry of a kite?

If the adjacent sides of two disjoint quadrilaterals are equal, the quadrilateral will be referred to as a kite. Polygons can be divided into two mirror-image halves by reflecting them over a line that divides them into symmetrical halves. Kites have a line of symmetry running down the centre.

5. What are the Lines of Symmetry of an isosceles trapezium?

A perpendicular bisector joins the two sides of the isosceles trapezium, the plane of symmetry. There is no symmetry in a scalene triangle. The perpendicular bisector of the base is the line of symmetry in the isosceles triangle. Look into this https://www.vedantu.com/question-answer/the-number-of-lines-of-symmetry-in-a-trapezium-Class-7-Mathss-cbse-604a4982cb615b4c750b070f from Vedantu.com to learn more about isosceles trapezium.