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Revision Notes

Constructions — Revision Notes

ICSE · Class 7 · Mathematics

Constructions revision notes for ICSE Class 7 Mathematics: 4 topics in quick points. Part of the ICSE Class 7 Mathematics syllabus.

54 questions31 flashcards7 formulas & key relations5 concepts

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Key Topics to Revise

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1. Construction of Angles

  • An angle congruent to a given angle is copied using the same arc radius at both vertices and then matching the arc distance.
  • An angle can be bisected into two equal parts.
  • A 60° angle is constructed by drawing equal arcs from two points on a line segment.
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2. Special Constructions

  • The perpendicular bisector of a line segment cuts the segment into two equal parts at 90°.
  • Every line segment has one and only one perpendicular bisector.
  • To construct a perpendicular to a line at a point on it, first construct 90° at that point.
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3. Construction of Triangles

  • A triangle can be constructed when three sides are given, if the sum of any two sides is greater than the third side.
  • A triangle can be constructed when two sides and the included angle are given.
  • A triangle can be constructed when two angles and the included side are given.
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4. Isosceles and Equilateral Triangles

  • In an isosceles triangle, the base angles are equal.
  • The vertex angle is the angle between the two equal sides.
  • An isosceles triangle can be constructed when the base and one base angle are given.

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Full Notes

Key Concepts

To copy an angleAn angle is bisected by drawing60° is made by an equilateralA perpendicular bisector cuts a segmentA perpendicular can be drawn through

Frequently Asked Questions

What are the important topics in Constructions for ICSE Class 7 Mathematics?
Key topics in Constructions include Construction of Angles, Special Constructions, Construction of Triangles, Isosceles and Equilateral Triangles. Study these first, then practise questions on each for Class 7 exams.
How should I revise Constructions for Class 7 exams?
Learn the core ideas first, then work through the 54 practice questions on Constructions. Revise 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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All ICSE Class 7 Mathematics Revision Notes

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