Class 6 · Chapter 2
Lines and Angles
Points, lines, rays, and how angles are measured and classified.
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Ganita Prakash · Class 6 (2026-27)
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Tip: NCERT updated the syllabus for 2026-27. The links above open the latest edition on the official portal — chapter titles and numbering may differ from the notes shown here.
Detailed theory
In geometry we start with the smallest object — a point. Combining points gives lines, rays, and segments. Two lines can be parallel or intersecting.
Key concepts & formulas
01
A **point** has no size; a **line** extends infinitely both ways.
02
A **ray** starts at a point and goes on forever; a **line segment** has two endpoints.
03
An **angle** is formed by two rays meeting at a vertex.
04
Angle types: acute (), right (), obtuse (-), straight (), reflex ().
05
Angles at a point sum to ; on a straight line sum to .