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Chapter Contents

Important area formulas of 2D shapes
Perimeter formulas of 2D shapes

List of Area and Perimeter Formulas of 2D Shapes

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Chapter Contents

Important area formulas of 2D shapes
Perimeter formulas of 2D shapes

Maths Query > Unit > Things to Remember > Formulas

Important area formulas of 2D shapes

Polygon	Area
Rectangle	l × b
Square	a × a = a²
Parallelogram	b × h
Rhombus	b × h or $\frac{1}{2} \times d_{1} \times d_{2}$
Trapezium	$\frac{1}{2} (a + b) \times h$
Triangle	$\frac{1}{2} \times b \times h$
Isosceles triangle	$\frac{b \sqrt{a^{2} - b^{2}}}{4}$
Equilateral triangle	$\frac{\sqrt{3}}{4} a^{2}$
Circle	πr²

Perimeter formulas of 2D shapes

Polygon	Perimeter
Rectangle	2(l + b)
Square	4a
Parallelogram	2(a + b)
Rhombus	4a or $2 \sqrt{{d_{1}}^{2} + {d_{2}}^{2}}$
Trapezium	a + b + c + d
Triangle	a + b + c
Isosceles triangle	2a + b
Equilateral triangle	3a
Circle	Circumference = 2πr

Last updated on: 08-01-2025

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