Chapter 2: Lines and Angles Notes

✓ Free notes Class 6 Maths 1 study file

About these notes

Class 6 Maths Chapter 2 Lines and Angles gives clear chapter notes with definitions, labelled diagrams, angle types and protractor tips for CBSE and Bihar Board students. Main sub-topics: point, line (रेखा), line segment, ray; intersecting, parallel (समांतर) and perpendicular (लंब) lines; types of angles (acute, obtuse, right, straight, reflex), adjacent angles, linear pair (sum = 180°), vertically opposite angles and measuring angles with a protractor. Suitable for Class 6 revision and to prepare for school chapter tests, unit tests, MCQ practice and building important questions for mock tests on Merit Spring ROH.

Key points you will learn

Class 6 Maths Chapter 2 Lines and Angles notes
Definitions: point, line (रेखा), line segment and ray with symbols
Types of angles: acute, obtuse, right (90°), straight (180°) and reflex
How to measure and draw angles using a protractor — step-by-step
Intersecting, parallel (समांतर) and perpendicular (लंब) lines — identification rules
Adjacent angles, linear pair (sum = 180°) and vertically opposite angles (equal)
Labelled diagrams practice and quick marking tips for revision

What is inside this chapter

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Lines and Angles - Chapter 2 Notes (Class 6 Maths)

Class 6 Maths Lines and Angles - Chapter 2 handwritten-style revision notes for CBSE and Bihar Board students.

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Questions students ask

Where to find Class 6 Maths Lines and Angles notes and important questions?

Find the Class 6 Maths Chapter 2 Lines and Angles notes on the Merit Spring ROH chapter page; the notes cover key definitions, diagrams and protractor steps. For important questions and MCQ practice, use the site’s chapter tests and mock tests.

How to measure and draw angles with a protractor?

To measure, place the protractor centre at the vertex, align one ray with the zero mark and read the degree where the other ray crosses; to draw, mark the required degree and join it to the vertex with a ruler.

What is the difference between adjacent angles and vertically opposite angles?

Adjacent angles share a common side and vertex and lie next to each other, while vertically opposite angles are formed by two intersecting lines and are equal in measure.

How do you identify parallel and perpendicular lines in a figure?

Parallel lines never meet and remain equidistant; check direction or measure short perpendicular distances. Perpendicular lines meet at 90°, so look for or construct a right angle to confirm.

What is a linear pair and why do their measures add to 180°?

A linear pair is two adjacent angles whose non-common sides form a straight line; because a straight line measures 180°, the sum of the two angles in a linear pair equals 180°.

More Maths chapters

Chapter 1: Patterns Mathematics Chapter 3: Number Play Chapter 4: Data Handling and Presentation Chapter 5: Prime Time Chapter 6: Perimeter and Area Chapter 7: Fractions All chapters →

Class 6 — other subjects

English Science Social Science

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