List of Area and Perimeter Formulas of 2D Shapes

Important area formulas of 2D shapes

Table of area formulas of 2D shapes

2D shape	Area
Rectangle	l × b
Square	a × a = a2
Parallelogram	b × h
Rhombus	b × h or $\frac{1}{2}\times {\mathrm{d}}_1\times {\mathrm{d}}_2$
Trapezium	$\frac{1}{2}\left(\mathrm{a\; +\; b}\right)\times h$
Triangle	$\frac{1}{2}\times b\times h$
Isosceles triangle	$\frac{b\sqrt{{\mathrm{4a}}^2-b^2}}{4}$
Equilateral triangle	$\frac{\sqrt{3}}{4}{\mathrm{a}}^2$
Circle	πr2

Perimeter formulas of 2D shapes

Table of perimeter formulas of 2D shapes

2D shape	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

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