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Revision Notes

Constructions and Tilings

CBSE · Class 7 · Mathematics

Quick revision notes for Constructions and Tilings — CBSE Class 7 Mathematics. Key concepts, formulas, and definitions for last-minute revision.

54 questions60 flashcards5 concepts

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Key Topics to Revise

1

Geometric Constructions

  • An eye figure is symmetrical only when the upper and lower arcs have equal radius.
  • For symmetry in the eye figure, AX = AY = BX = BY.
  • The points A and B lie on the perpendicular bisector of XY because they are equidistant from X and Y.
2

Perpendicular Bisector and Right Angle Construction

  • Draw equal-radius arcs from X and Y above and below XY to locate A and B.
  • Join A and B to get the perpendicular bisector of XY.
  • A point equidistant from X and Y lies on the perpendicular bisector of XY.
3

Angle Bisection, Angle Copying, and Parallel Lines

  • Angle bisection works by choosing A and B so that OA = OB.
  • Then equal-radius arcs from A and B meet at C.
  • The line OC bisects angle AOB.
4

Trefoil Arch, Pointed Arch, and Regular Hexagon

  • A symmetric trefoil or arch design needs equal side lengths on the support lines and equal base angles.
  • For symmetry, AB = CD and ∠BAD = ∠CDA.
  • A pointed arch can be made from two equal line segments whose midpoints are used as supports.

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Full Notes

Key Concepts

A perpendicular bisector is a lineAn eye shape looks symmetrical whenA 90° angle at a pointThe ŚulbaTo bisect an angle

Frequently Asked Questions

What are the important topics in Constructions and Tilings for CBSE Class 7 Mathematics?
Constructions and Tilings covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Constructions and Tilings — CBSE Class 7 Mathematics?
Understand the core concepts first, then work through the 54 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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