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Formula Sheet

Area and Perimeter of Plane Figures

ICSE · Class 9 · Mathematics

All formulas from Area and Perimeter of Plane Figures in ICSE Class 9 Mathematics. Key equations, constants, and identities for board exam preparation.

45 questions31 flashcards5 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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12 Formulas · 3 Sections

Formulas

Triangles

Area = 1/2 × base × corresponding height (altitude) = 1/2 BC × AD

Area = √(s(s-a)(s-b)(s-c))

Perimeter = a+b+c = 2s

Equilateral triangle: Perimeter = 3a

Equilateral triangle: Area = (√3/4)a²

Quadrilaterals

Area of quadrilateral = 1/2 × AC × (BX + DY)

Area of quadrilateral = 1/2 × AC × BD

Special Quadrilaterals

Rectangle: Area = l × b

Rectangle: Perimeter = 2(l+b)

Rectangle: d = √(l²+b²)

Square: Area = a²

Square: Perimeter = 4a

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Frequently Asked Questions

What are the important topics in Area and Perimeter of Plane Figures for ICSE Class 9 Mathematics?
Area and Perimeter of Plane Figures covers several key topics that are frequently asked in ICSE Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Area and Perimeter of Plane Figures — ICSE Class 9 Mathematics?
Understand the core concepts first, then work through the 45 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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