Parallel and Intersecting Lines
CBSE · Class 7 · Mathematics
Complete topic list for Parallel and Intersecting Lines in CBSE Class 7 Mathematics. Key concepts, sub-topics, and what to focus on for board exams.
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Topics in Parallel and Intersecting Lines
1. Intersecting Lines and Their Angles
- When two lines intersect, four angles are formed at the point of intersection.
- Adjacent angles formed by two intersecting lines make a linear pair.
- A linear pair always adds up to a straight angle.
2. Parallel Lines
- Parallel lines lie on the same plane and do not meet however far they are extended at both ends.
- Lines that never meet are not automatically parallel if they are not in the same plane.
- Opposite edges of a sheet of paper are a simple example of parallel lines.
3. Transversal and Angle Relationships
- A transversal is a line that intersects two different lines.
- When a transversal cuts two lines, eight angles are formed.
- These eight angles can have at most four distinct measures.
4. Drawing and Recognising Line Relationships
- A ruler and set square can be used to draw perpendicular and parallel lines.
- Sliding a set square along a base line helps draw a new line at the same angle, making parallel lines.
- Perpendicular lines make right angles.
Key Concepts
Central concept: Relationships among lines on a plane: intersecting, perpendicular, parallel, and lines cut by a transversal
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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