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Syllabus

Rectilinear Figures — Syllabus

ICSE · Class 9 · Mathematics

What Rectilinear Figures covers in ICSE Class 9 Mathematics: 3 topics, for the 2026-27 session. Part of the ICSE Class 9 Mathematics syllabus.

39 questions30 flashcards5 concepts

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A diagram illustrating the difference between convex and concave polygons, highlighting the interior angles.
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3 Topics · ICSE Class 9 Mathematics · 2026-27

Topics in Rectilinear Figures

1

Polygons and Their Angle Sums

  • A polygon is a closed plane figure bounded by at least three line segments.
  • A polygon with 3 sides is a triangle, 4 sides a quadrilateral, 5 sides a pentagon, 6 sides a hexagon, 7 sides a heptagon, and 8 sides an octagon.
  • If each angle of a polygon is less than 180°, it is a convex polygon.
2

Quadrilaterals and Their Properties

  • A quadrilateral is a closed plane figure bounded by four line segments.
  • A quadrilateral has four vertices and two diagonals.
  • The diagonals of a quadrilateral join opposite vertices.
3

Theorems and Proof-Based Results

  • In a parallelogram, both pairs of opposite sides are equal.
  • In a parallelogram, both pairs of opposite angles are equal.
  • In a parallelogram, each diagonal bisects the parallelogram into two equal-area triangles.

Key Concepts

Central concept: Rectilinear figures and special kinds of quadrilaterals

Rectilinear figurePolygonsAngle sums in polygonsQuadrilateralsSpecial quadrilateralsParallel sides propertiesDiagonal propertiesTheorems and proofs

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Frequently Asked Questions

What are the important topics in Rectilinear Figures for ICSE Class 9 Mathematics?
Key topics in Rectilinear Figures include Polygons and Their Angle Sums, Quadrilaterals and Their Properties, Theorems and Proof-Based Results. Study these first, then practise questions on each for Class 9 exams.
How should I revise Rectilinear Figures for Class 9 exams?
Learn the core ideas first, then work through the 39 practice questions on Rectilinear Figures. 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 9 Mathematics Syllabus

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