Chapter 9 Topics – Tangent and Angles of a Circle
Click on any topic to expand and view its exercises. Each section includes step-by-step solutions and real-world applications.
9.1 – Tangent Properties & Angle Relationships
Tangent perpendicular to radius, equal tangents, external/internal tangency
New 2026
This section covers the fundamental properties of tangents: a tangent is perpendicular to the radius at the point of contact, tangents from an external point are equal, and the relationships for circles touching externally or internally.
9.1
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Exercise 9.1
Tangent properties & applications
9.2 – Angles in Circles & Arc Length
Central angles, inscribed angles, same segment, cyclic quadrilaterals, arc length, sector area
New 2026
This section covers angle relationships in circles: central angles, inscribed angles, angles in the same segment, angles in a semicircle, cyclic quadrilaterals, and arc length and sector area calculations using radians.
9.2
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Exercise 9.2
Angles, arc length & sector area
Review Exercise 9
Complete revision and mixed practice problems
New 2026
The review exercise mixes questions from both sections of Chapter 9, giving you a chance to test whether you can move between topics without a hint about which method applies — a useful checkpoint before exams.
R
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Review Exercise 9
Complete Revision & Practice
Tangent and Angles of a Circle – What's Inside This Chapter (PECTAA 2026)
Chapter 9 – Tangent and Angles of a Circle is part of Class 10 Mathematics under the Revised National Curriculum 2023. Tangents and circle angles are fundamental in geometry and design. This unit covers tangent properties, angle relationships in circles, and their applications in engineering design, robotics path planning, and optical systems.
Prepared by Muhammad Tayyab, Govt Christian High School Daska, this chapter's notes cover all 2 exercises plus the review exercise, with step-by-step solutions throughout.
✅ What This Chapter Covers
- ✓Tangent properties, angle relationships, geometry and design applications
- ✓Step-by-step solved exercises for all 2 sections
- ✓Based on the PECTAA 2026 syllabus
- ✓A complete review exercise for revision
- ✓Free access, no downloads required
🌐 Why This Chapter Matters
Tangents and circle angles are fundamental in geometry and design. This unit covers tangent properties, angle relationships in circles, and their applications in engineering design, robotics path planning, and optical systems.
Mastering this chapter builds a foundation for higher studies and board exam success under the PECTAA 2026 syllabus.
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Chapter 8: Chords and Arcs of a Circle
Relationships between chords, arcs, angles, and design and engineering applications for circular geometry.
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Chapter 9: Tangent and Angles of a Circle
Tangent properties, angle relationships, and geometry and design applications with construction techniques.
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Chapter 10: Practical Geometry of Circles
Geometric constructions, tangents, inscribed figures, and step-by-step methods for technical drawing.
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