Area of plane shapes

Here’s a useful guide to calculating the area of basic shapes.

Rectangle

Area = w × h
w = width
h = height
Triangle

Area = ½b × h
b = base
h = vertical height
Square

Area = a2
a = length of side
Trapezium

Area = ½(a+b)×h
h = vertical height
Parallelogram

Area = b × h
b = base
h = vertical height
Ellipse

Area = πab
Sector

Area = ½r2θ
r = radius
θ = angle in radians
Circle

Area =
πr2
Circumference = 2πr
r = radius

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