Area of Circle, Triangle, Square, Rectangle, Parallelogram, Trapezium, Ellipse and Sector

	Triangle Area = ½b×h b = base h = vertical height			Square Area = a² a = length of side
	Rectangle Area = b×h b = breadth h = height			Parallelogram Area = b×h b = breadth h = height
	Trapezoid (US) Trapezium (UK) Area = ½(a+b)h h = vertical height			Circle Area = πr² Circumference=2πr r = radius
	Ellipse Area = πab			Sector Area = ½r²θ r = radius θ = angle in radians

Area of Plane Shapes