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Understanding shape

ICSE · Class 8 · Mathematics

Complete topic list for Understanding shape in ICSE Class 8 Mathematics. Key concepts, sub-topics, and what to focus on for board exams.

63 questions28 flashcards5 concepts

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4 Topics · ICSE Class 8 Mathematics

Topics in Understanding shape

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°.

Key Concepts

Central concept: Shapes on a plane and polygons

CurveOpen curveClosed curveSimple closed curveRegion of a curvePolygonTypes of polygonsDiagonal

Frequently Asked Questions

What are the important topics in Understanding shape for ICSE Class 8 Mathematics?
Understanding shape covers several key topics that are frequently asked in ICSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Understanding shape — ICSE Class 8 Mathematics?
Understand the core concepts first, then work through the 63 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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All 25 chapters — ICSE Class 8 Mathematics Syllabus

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