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Revision Notes

Geometrical Constructions

Telangana Board · Class 9 · Mathematics

Quick revision notes for Geometrical Constructions — Telangana Board Class 9 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

45 questions20 flashcards5 concepts

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Key Topics to Revise

1

Basic Constructions

  • Use only ruler (ungraduated) and compass for pure geometric constructions
  • Every construction must have logical justification using congruence rules
  • Perpendicular bisector divides a line segment into two equal parts at 90°
2

Triangle Constructions - Special Cases

  • When sum of two sides is given: Extend one side and use perpendicular bisector method
  • When difference of two sides is given: Mark the difference on extended/reduced side
  • For perimeter constructions: Draw line equal to perimeter, then use angle bisectors
3

Circle Segment Construction

  • Circle segment contains all points that subtend the same angle on a given chord
  • Angle at center = 2 × angle at circumference (same arc)
  • Use the relationship between central and inscribed angles

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Full Notes

Key Concepts

Construction uses only ungraduated ruler (forMethodMethod60° angleGiven

Frequently Asked Questions

What are the important topics in Geometrical Constructions for Telangana Board Class 9 Mathematics?
Geometrical Constructions covers several key topics that are frequently asked in Telangana Board 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 Geometrical Constructions — Telangana Board 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.

Sources & Official References

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

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