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Revision Notes

Circles

CBSE · Class 10 · Mathematics

Quick revision notes for Circles — CBSE Class 10 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

67 questions24 flashcards5 concepts

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An illustration comparing the three possible positions of a line relative to a circle: non-intersecting, secant, and tangent.
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Key Topics to Revise

1

Line and Circle Relationships

  • Three possible positions of a line with respect to a circle: non-intersecting, secant, and tangent
  • Non-intersecting line: No common points with the circle
  • Secant: Line intersecting circle at two distinct points
2

Tangent Properties and Theorems

  • Theorem 10.1: Tangent is perpendicular to radius at point of contact
  • At any point on a circle, there is exactly one tangent
  • The radius through point of contact is called the normal to the circle
3

Number of Tangents from Different Points

  • From point INSIDE circle: Zero tangents possible
  • From point ON circle: Exactly one tangent
  • From point OUTSIDE circle: Exactly two tangents
4

Theorem Proofs and Applications

  • Proof of Theorem 10.1 uses the fact that tangent gives shortest distance from center to line
  • Proof of Theorem 10.2 uses congruent right triangles (RHS congruency)
  • Alternative proof using Pythagoras theorem: PT₁² = PO² - r² = PT₂²

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Full Notes

Key Concepts

There are exactly three waysThe tangent at any pointThe number of tangents depends onWhen two tangents are drawn fromThe point of contact is where

Frequently Asked Questions

What are the important topics in Circles for CBSE Class 10 Mathematics?
Circles covers several key topics that are frequently asked in CBSE Class 10 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 — CBSE Class 10 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.

Sources & Official References

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

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