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