# NCERT Solutions for Class 9 Maths Chapter 7 Exercise 7.1

NCERT Solutions for Class 9 Maths Chapter 7 Exercise 7.1 Triangles in Hindi Medium and English Medium updated for new academic session 2021-2022 CBSE First term Exam. The UP Board students are also using NCERT Textbook, so they also benefit from these simplified solutions available in Hindi and English.

Videos related to Class 9 Maths Exercise 7.1 are given here in Hindi and English Medium in a simplified format. All the questions are done in easy to understand language.## Class 9 Maths Chapter 7 Exercise 7.1 Solutions in Hindi and English

### NCERT Solutions for Class 9 Maths Chapter 7 Exercise 7.1 in Hindi and English Medium

Class: 9 | Mathematics |

Chapter: 7 | Triangles |

Exercise: 7.1 | NCERT Solutions in PDF and Videos |

### Class 9 Maths Exercise 7.1 Solution in Hindi Medium Video

#### Class 9 Maths Chapter 7 Exercise 7.1 Solution in Videos

#### Class 9 Maths Chapter 7 Exercise 7.1 Solution

#### More about Triangles

We have studied about triangles and their various properties in our previous classes. We know that a closed figure made of three intersecting lines is called a triangle. (“Tri” means “three”). A triangle has three sides, three angles, and three corners. For example, ABC marked as; ABC, AB, BC, CA, three sides, ∠A, ∠B, ∠C, three angles, and A, B, C are three vertices in the triangle.

##### Congruence of Triangles

We may have noticed that two copies of our photos of the same size are the same. Similarly, two bracelets of the same size, two ATM cards issued by the same bank, are identical. We will remember that by placing one-rupee coin on another coin in the same year, they completely cover each other. Do you remember what those figures are called? They are called congruent shapes (“congruent” means the same in all types of shapes that have the same shapes and sizes). Now, draw two circles of the same radius and place one on top of the other. What do we observe? They cover each other completely, and we call them congruent circles.

###### Activities based on Triangles

In Chapter 6, we have also studied some properties of triangles. This chapter will study in detail the congruency of triangles, the laws of congruency, some more properties and oddities of triangles. We have already verified most of these assets in previous classes. Now we will test some of them. Do an activity by placing one square on top of the other with equal length sides or placing two equilateral triangles with equal sides on top of each other. We will see that the squares are identical with each other and hence are equilateral triangles.

##### Which congruence rules help students to solve questions of exercise 7.1 of class 9th Maths?

There are five congruence rules in chapter 7 of class 9th Maths out of which three congruence rules help students to solve questions and examples of exercise 7.1 of class 9th Maths.

These three rules are:

- 1. SAS congruence rule (Side-Angle-Side).
- 2. ASA congruence rule (Angle-Side-Angle).
- 3. AAS congruence rule (Angle-Angle-Side).

##### Is Exercise 7.1 of class 9 Maths easy to understand or difficult to solve?

Class 9 Maths Exercise 7.1 is just a necessary exercise based on the rules of congruency. If the concepts of congruency are clear, the exercise is easy to understand.

##### Which problems of exercise 7.1 of grade 9th Maths are expected for exams?

Exercise 7.1 has three examples (examples 1, 2, 3) and eight questions. Examples 1, 2 and questions 3, 5, 6, 7, 8 of exercise 7.1 of grade 9th Maths are expected for exams because these are the most important problems of exercise 7.1 and have already come in the exam several times. These examples and questions can come in three or more than three marks.

##### Which is the most critical question in Exercise 7.1 of 9th Maths?

Question number 7 and 8 are the questions which are asked frequently in school exams.

##### What does SAS, ASA, AAS stand for in exercise 7.1 of class 9th Maths?

**SAS congruence rule**:

Two triangles are congruent if two sides and the included angle of one triangle are equal to the two sides and the included angle of the other triangle.

**ASA congruence rule**:

Two triangles are congruent if two angles and the included side of one triangle are equal to two angles and the included side of other triangle.

**AAS Congruence Rule**:

If two angles and one side of one triangle are equal to two angles and the corresponding side of the other triangle, then the two triangles are congruent.

There are a total of three examples just before exercise 7.1 of CBSE Class 9 Maths. Example 3 is simple, but most of the time, asked in exams.

##### Which questions of exercise 7.1 of 9th Maths are easy and which are difficult?

Examples 1, 3 and questions 1, 2, 3, 4, 5 are easy questions of exercise 7.1 of 9th Maths, and example 2 and questions 6, 7, 8 are complicated questions of exercise 7.1 of 9th Maths. It can vary from student to student also.

##### Is exercise 7.1 of class 9th Maths lengthy?

No, exercise 7.1 of class 9th Maths is not lengthy. There are only three examples and eight questions in this exercise. Students can complete this exercise within three days if they give 1-2 hours per day to this exercise. This time also depends on the student’s working speed.