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Revision Notes

Circles

ICSE · Class 8 · Mathematics

Quick revision notes for Circles — ICSE Class 8 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

61 questions28 flashcards5 concepts

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Key Topics to Revise

1

1. Basic Parts of a Circle

  • A circle is formed by a point moving at a constant distance from a fixed point.
  • The fixed point inside the circle is called the centre.
  • The fixed distance from the centre is called the radius.
2

2. Position of Points: Interior, On the Circle, and Exterior

  • A point lies on the circumference if its distance from the centre is equal to the radius.
  • A point lies in the interior of the circle if its distance from the centre is less than the radius.
  • A point lies in the exterior of the circle if its distance from the centre is greater than the radius.
3

3. Arcs, Semicircle, Major Arc, and Minor Arc

  • A part of the circumference of a circle is called an arc.
  • A diameter divides the circumference into two equal arcs.
  • Each of the two equal arcs is called a semicircle.
4

4. Sector and Segment

  • A sector is the part of a circle bounded by two radii and an arc.
  • A minor sector is bounded by two radii and a minor arc.
  • A major sector is bounded by two radii and a major arc.

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Full Notes

Key Concepts

A circle is formed whenThe fixed point inside the circleThe length of the boundaryA chord joins any two pointsDiameter = 2 × radius

Frequently Asked Questions

What are the important topics in Circles for ICSE Class 8 Mathematics?
Circles covers several key topics that are frequently asked in ICSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Circles — ICSE Class 8 Mathematics?
Understand the core concepts first, then work through the 61 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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