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Math Cheat Sheet 2D Shapes (Area Formulas) Cheat Sheet by

Basic maths formulas for area of 2D shapes

Rectangle

A = l x w
A = Area
l = length
w = width (or base)

Square

A = l²
A = Area
l = length
 

Circle

A = π r²
A = Area
r = radius

Semi-C­ircle

A = 0.5 x (π x r2)
A = Area
r = radius
 

Pythag­ora­sTh­eorem

c² = b² + a²
c = √c²
c = hypotenuse
a = leg 1
a² = c² - b²
a = √a²
b = leg 2
b² = c² - a²
b = √b²

Triangle

A = h x b ÷ 2
A = Area
h = height
b = base
       
 

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