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Area and Perimeter of Plane Figures — Revision Notes

ICSE · Class 9 · Mathematics

Area and Perimeter of Plane Figures revision notes for ICSE Class 9 Mathematics: 3 topics in quick points. Part of the ICSE Class 9 Mathematics syllabus.

45 questions31 flashcards14 formulas & key relations5 concepts

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A visual comparison defining perimeter as the length of the boundary and area as the measure of the surface enclosed by the boundary, using simple geometric shapes like a square and a rectangle.
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Key Topics to Revise

1

1. Basic Ideas and Units

  • Perimeter is the length of the boundary of a plane figure.
  • Area is the measure of the surface enclosed by the boundary of a plane figure.
  • Perimeter uses the same unit as length.
2

2. Area of Triangles

  • Quadrilateral area can sometimes be split into two triangles.
  • A quadrilateral with one diagonal and two perpendiculars from the other vertices has a special area formula.
  • If two diagonals of a quadrilateral cut at right angles, the area is half the product of the diagonals.
3

4. Circle: Circumference, Area, and Rotation

  • Circumference is the length of the boundary of a circle.
  • π is the constant ratio of circumference to diameter for every circle.
  • The value of π is taken as 22/7 or 3.14 approximately.

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Full Notes

Key Concepts

Perimeter is the length ofArea is the measure ofArea of triangle = 1/2 ×Area = √(s(sAll sides are equal

Frequently Asked Questions

What are the important topics in Area and Perimeter of Plane Figures for ICSE Class 9 Mathematics?
Key topics in Area and Perimeter of Plane Figures include Basic Ideas and Units, Area of Triangles, Circle: Circumference, Area, and Rotation. Study these first, then practise questions on each for Class 9 exams.
How should I revise Area and Perimeter of Plane Figures for Class 9 exams?
Learn the core ideas first, then work through the 45 practice questions on Area and Perimeter of Plane 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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