Area of Plane Shapes

	Triangle مثلث Area = ½b × h b = base h = vertical height		Square مربع Area = a^2 a = length of side
	Rectangle مستطيل Area = w × h w = width h = height		Parallelogram متوازي أضلاع Area = b × h b = base h = vertical height
	Trapezoid (US) شبه منحرف Trapezium (UK) Area = ½(a+b) × h h = vertical height		Circle دائرة Area = πr^2 Circumference=2πr r = radius
	Ellipse بيضاوي Area = πab		Sector قطاع Area = ½r^2θ r = radius θ = angle in radians

	Triangle مثلث Area of a triangle from sides (Heron's formula)
	Triangle مثلث Area of a triangle from two sides and included angle