Circle
ICSE · Class 9 · Mathematics
Complete topic list for Circle in ICSE Class 9 Mathematics. Key concepts, sub-topics, and what to focus on for board exams.
Topics in Circle
Basic Definitions and Components
- A circle is the locus of all points in a plane that are at a fixed distance from a fixed point
- The fixed point is called the centre and the fixed distance is called the radius
- Circumference is the perimeter of the circle
Special Types of Circles and Polygons
- Concentric circles have the same centre but different radii
- Equal or congruent circles have equal radii
- A circumscribed circle passes through all vertices of a polygon
Arcs, Segments, and Sectors
- An arc is a part of the circumference of a circle
- Minor arc is smaller than semicircle, major arc is larger than semicircle
- When both arcs are equal, each is called a semicircle
Chord Properties and Theorems
- Theorem 22: A line from centre to bisect a chord (not diameter) is perpendicular to the chord
- Theorem 23: A perpendicular from centre to a chord bisects the chord
- Greater chord is closer to centre, smaller chord is farther from centre
Key Concepts
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What are the important topics in Circle for ICSE Class 9 Mathematics?
Circle covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Circle — ICSE Class 9 Mathematics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.
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