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# NCERT Solutions For Class 9 Maths Chapter 5 Exercise 5.1 Introduction To Euclid’s Geometry - PDF Download

Class 9

NCERT solutions for class 9 maths chapter 5 ex 5.1 Introduction to Euclid's geometry includes problems based on validation statements, definition, and proven sums. It is essential for every student to have a basic understanding of geometry. Class 9 maths chapter 5 exercise 5.1 NCERT solutions consists of seven questions, which focus on fundamental concepts, theorems, facts, and definitions.

By learning the fundamental properties of Euclid's definitions, axioms, postulates etc., students will be able to understand the basic concepts. Practicing the questions in NCERT solutions will help students to concentrate and develop the necessary skills to perform well in exams. These solutions are prepared by our academic team of experts which provides all the concepts related to euclid’s geometry. You can also download the free PDF of these solutions to prepare for exams.

## Topics Covered in Exercise 5.1 class 9 Mathematics Questions

Ex 5.1 class 9 maths solutions covers euclid’s definitions, axioms, postulates and theorems. Here, we will discuss these topics in a detailed manner.

 1 Euclid’s Definitions 2 Axioms 3 Postulates 4 Theorem 5.1
1. Euclid’s Definitions - According to Euclid (Father of Geometry), geometry is an abstract representation of the world we see around us, such as the notions of lines, planes, surfaces, etc.

He presented these notions in the form of definitions.

1. A point is that which has no part.

2. A line is breadthless length.

3. The ends of a line are points.

4. A straight line is a line which lies evenly with the points on itself.

5. A surface is that which has length and breadth only.

6. The edges of a surface are lines.

7. A plane surface is a surface which lies evenly with the straight lines on itself

2. Axioms - Axioms are the assumptions which are obvious universal truths. They are not proven.

Some of Euclid’s axioms are :

• Things which are equal to the same thing are equal to one another.

• If equals are added to equals, the wholes are equal.

• If equals are subtracted from equals, the remainders are equal.

• Things which coincide with one another are equal to one another.

• The whole is greater than the part.

• Things which are double of the same things are equal to one another.

• Things which are halves of the same things are equal to one another.

3. Postulates - Postulates are assumptions that are very specific in geometry.

There are five postulates given by Euclid:

1. Postulate 1 : A straight line may be drawn from any one point to any other point

2. Postulate 2 : A terminated line can be produced indefinitely.

3. Postulate 3 : A circle can be drawn with any center and any radius.

4. Postulate 4 : All right angles are equal to one another.

5. Postulate 5 : If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely, meet on that side on which the sum of angles is less than two right angles.

4. Theorem 5.1 - Two distinct lines cannot have more than one point in common.

## Tips for Solving Exercise 5.1 class 9 chapter 5 Introduction To Euclid’s Geometry

Exercise 5.1 class 9 chapter 5 includes questions associated with euclid’s geometry and their concepts. Also you will study an important theorem mentioned in the chapter. Before solving the questions you must learn the concepts and easy tips to complete the ex 5.1 questions with ease.

1. Practicing NCERT solutions class 9 maths chapter 5 ex 5.1 on a regular basis will help you understand the fundamentals of geometry.

2. Ex 5.1 NCERT solutions class 9 maths, which consists of questions based on the true or false and proving of sums, will enable students to cover all essential topics in a short period of time.

3. In addition to solving the questions, students also need to remember the definitions, the axioms, and the postulates mentioned in NCERT solutions class 9 maths chapter 5 ex 5.1, which will help them to revise all the concepts in a short time during the exams and improve their overall learning.

## Importance of Solving Ex 5.1 class 9 Maths chapter 5 Introduction To Euclid’s Geometry

There are many advantages to using NCERT solutions for solving ex 5.1 questions. Here are some of the advantages of NCERT class 9 math chapter 5 exercise 5.1 solutions for students.

1. eSaral’s NCERT class 9 maths chapter 5 ex 5.1 solutions offer a comprehensive knowledge of topics and associated concepts of euclid’s definitions, axioms, postulates etc.

2. Students can also download NCERT chapter 5 ex 5.1 maths solutions PDF from eSaral for free and study from it whenever they like.

3. Solutions include an in-depth analysis of challenging questions from each part of the exercise.

4. These solutions are entirely reliable and can be utilized by students in the preparation for their exams.

#### Frequently Asked Questions

Question 1. Write Euclid's axioms given in chapter 5 ex 5.1 class 9 maths?

Answer 1. Euclid’s axioms are:

1. Things which are equal to the same thing are equal to one another.

2. If equals are added to equals, the wholes are equal.

3. If equals are subtracted from equals, the remainders are equal.

4. Things which coincide with one another are equal to one another.

5. The whole is greater than the part.

6. Things which are double of the same things are equal to one another.

7. Things which are halves of the same things are equal to one another.

Question 2. What are Euclid's five postulates in chapter 5 ex 5.1 class 9 maths?

Answer 2. Euclid's geometry has five important postulates. These postulates include:

1. Postulate 1 : A straight line may be drawn from any one point to any other point

2. Postulate 2 : A terminated line can be produced indefinitely.

3. Postulate 3 : A circle can be drawn with any center and any radius.

4. Postulate 4 : All right angles are equal to one another.

5. Postulate 5 : If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than two right angles, then the two straight lines, if produced indefinitely, meet on that side on which the sum of angles is less than two right angles.