NCERT Solutions for Class 9 Maths Exercise 5.2 Introduction to Euclidâ€™s Geometry in Hindi and English Medium prepared for CBSE and State Boards. Access expert-crafted NCERT Class 9 Maths solutions for Exercise 5.2 on Euclidâ€™s Geometry, available in both Hindi and English for CBSE and State Boards students.

### NCERT Solutions for Class 9 Maths Exercise 5.2

Class 9 Maths Exercise 5.2 is now updated for CBSE and State Board students. Questions are solved in simplified manner in Hindi and English. The Maths solutions and explanation are easy to understand for all the students.

Class: 9 | Mathematics |

Chapter: 5 | Exercise: 5.2 |

Topic: | Introduction to Euclid’s Geometry |

Content: | NCERT Exercise Solution |

Medium: | English and Hindi Medium |

### Euclidâ€™s Axioms and Postulates

Euclidâ€™s main contribution was the introduction of five postulates. Axioms or postulates or the assumptions which are universal truths. Hence, they donâ€™t require proofs. Euclid collected all the known works and raised it in book called elements having 13 chapters.

In class 9 Maths chapter 5 the focus will be on Euclidâ€™s geometry consisting of axioms, and postulates. The most important among these is the last postulate. Postulate 1 to 4 are simple and obvious and as such not required to be proved. The terms axioms and postulates are used interchangeably.

#### Consistency of System of Axioms

A system of axioms are called consistent when it impossible to deduce from these axioms a statement that contradicts any axioms or previously proved statement. Using the results of axioms and postulates many theorems have been derived. A theorem is a statement which has to be proved by using definitions, axioms and reasoning. Altogether, there is chain of 465 propositions using these axioms. In NCERT (https://ncert.nic.in/) Solutions Exercise 5.2 there are only two questions.

##### Questions of Class 9 Maths Exercise 5.2

There are only two questions in 9th Mathematics exercise 5.2. So, it hardly needs to emphasized that both have to be done (both questions are based on postulate 5). Speaking of the 5th postulate, it can said that if a straight line cuts two straight lines in such a way that sum of the interior angles on the same side is less than 180 degree, the straight lines will meet on the side in which the sum of angles is less than 180 degree. Euclid’s postulate and division lemma in next classes are very important for to learn.

###### Euclidâ€™s Definitions in Modern world

Euclid conceptualise and defined the terms a point, a line or plane etc. However, these are not accepted by modern mathematicians. Hence, they remained undefined. It does not mean that the contribution of Euclid was a waste. In fact, He bought a revolution in the thinking process and his contribution was able to provide framework to work upon.