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Revision Notes

Understanding shape — Revision Notes

ICSE · Class 8 · Mathematics

Understanding shape revision notes for ICSE Class 8 Mathematics: 4 topics in quick points. Part of the ICSE Class 8 Mathematics syllabus.

63 questions28 flashcards7 formulas & key relations5 concepts

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Key Topics to Revise

1

1. Curves, Open Curves, and Closed Curves

  • All these figures are called curves.
  • In mathematics, a straight line is also called a curve.
  • A curve which does not cut itself is called an open curve.
2

2. Polygons and Their Parts

  • A polygon is a closed plane figure bounded by straight-line segments.
  • The line segments forming a polygon intersect only at end-points, and each end-point is shared by only two line segments.
  • The segments of a polygon are called its sides.
3

3. Types of Polygons

  • If each angle of a polygon is less than 180°, it is called a convex polygon.
  • If at least one internal angle of a polygon is more than 180°, it is called a concave or re-entrant polygon.
  • Unless it is stated, a polygon means a convex polygon.
4

4. Sum of Interior Angles of a Polygon

  • The number of triangles formed is two less than the number of sides in the polygon.
  • Sum of interior angles of a polygon with n sides = (n - 2) × 180°.
  • The same formula can also be written as (2n - 4) × 90°.

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Full Notes

Key Concepts

All figures drawn on a planeA curve which does not cutA curve which cuts itselfA closed curve is calledA closed curve drawn on

Frequently Asked Questions

What are the important topics in Understanding shape for ICSE Class 8 Mathematics?
Key topics in Understanding shape include Curves, Open Curves, and Closed Curves, Polygons and Their Parts, Types of Polygons, Sum of Interior Angles of a Polygon. Study these first, then practise questions on each for Class 8 exams.
How should I revise Understanding shape for Class 8 exams?
Learn the core ideas first, then work through the 63 practice questions on Understanding shape. 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 8 Mathematics Revision Notes

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