Last Updated on April 16, 2025 by XAM CONTENT
Hello students, we are providing assertion reason questions for class 6. Assertion Reason questions are the new question format that is introduced in CBSE board. The resources for assertion reason questions are very less. So, to help students we have created chapterwise assertion reason questions for class 6 maths. In this article, you will find assertion reason questions for CBSE Class 6 Maths Chapter 2 Lines and Angles. It is a part of Assertion Reason Questions for CBSE Class 6 Maths Series.
| Chapter | Lines and Angles |
| Type of Questions | Assertion Reason Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 6 |
| Subject | Maths |
| Useful for | Class 6 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 6 Maths Chapterwise Assertion Reason |
Assertion Reason Questions on Lines and Angles
Directions:
In the questions given below, there are two statements marked as Assertion (A) and Reason (R).
Read the statements carefully and choose the correct option:
(A) Both A and R are true, and R is the correct explanation of A.
(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
Q1. Assertion (A): The sum of angles on a straight line is 180°.
Reason (R): A straight angle measures 180°.
Difficulty Level: Medium
Ans. Option (A) is correct.
Explanation: A straight line forms a straight angle, and the total of angles forming a straight line is 180°. The reason directly explains the assertion.
Q2. Assertion (A): Vertically opposite angles are always supplementary.
Reason (R): Vertically opposite angles are equal in measure.
Difficulty Level: Hard
Ans. Option (C) is correct.
Explanation: The reason is true, but the assertion is false—vertically opposite angles are equal, not necessarily supplementary.
Q3. Assertion (A): An angle greater than 90° but less than 180° is called an obtuse angle.
Reason (R): An angle measuring exactly 90° is an acute angle.
Difficulty Level: Medium
Ans. Option (C) is correct.
Explanation: The assertion is true, but the reason is false—an angle of exactly 90° is a right angle, not acute.
Q4. Assertion (A): If two lines intersect at a point, then vertically opposite angles formed are always equal.
Reason (R): Intersecting lines form four angles at the point of intersection.
Difficulty Level: Hard
Ans. Option (B) is correct.
Explanation: Both are true, but the reason does not directly explain why vertically opposite angles are equal—it only states a fact about intersecting lines.
Q5. Assertion (A): A right angle measures 90 degrees.
Reason (R): All angles less than 90 degrees are called acute angles.
Difficulty Level: Medium
Ans. Option (B) is correct.
Explanation: Both statements are true, but the reason does not explain why a right angle measures 90°.
Also check
- Lines and Angles Class 6 Assertion Reason Questions Maths Chapter 2
- Patterns in Mathematics Class 6 Assertion Reason Questions Maths Chapter 1
🚀 Boost Your Exam Prep: Get assertion reason questions for all subjects (Class 6-12) now!
👉 Explore more resources on CBSE Class 6
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Topics from which assertion reason questions may be asked
- Types of Lines
- Types of Angles
- Measuring Angles
- Angle Pairs
Angles are formed when two lines meet—understanding them builds geometry skills.
Assertion reason questions from the above given topic may be asked.
Frequently Asked Questions (FAQs) on Lines and Angles Assertion Reason Questions Class 6
Q1: What does the chapter ‘Lines and Angles’ teach us?
A1: It covers core ideas such as lines and angles concepts that are foundational for further study.
Q2: What are assertion reason questions?
A2: These include two statements an assertion and a reason. Students must determine their correctness and relationship.
Q3: Are assertion reason questions part of Class 6 Maths exams?
A3: Yes, CBSE includes competency-based questions such as assertion-reason to assess deeper understanding.
Q4: How should one prepare for assertion reason questions in ‘Lines and Angles’?
A4: Understand each concept clearly and practice justifications and logical reasoning behind facts.
