Ruby program to calculate rectangle area and circumference

Following program shows you how to calculate rectangle area and circumference.
This program gets rectangle length and width from user and calculates area and circumference and prints them using following formulas
Area = length X width
Circumference = 2 X length + 2 X width

 puts "Enter length of rectangle:"
 rectangleLength = gets.to_f
 puts "Enter width of rectangle:"
 rectangleWidth = gets.to_f
 areaOfRectangle = rectangleLength * rectangleWidth
 puts "Area of rectangle is: #{areaOfRectangle}"
 circumferenceOfRectangle = 2 * (rectangleLength) + 2 * (rectangleWidth)
 puts "Circumference of rectangle is: #{circumferenceOfRectangle}"

Output:

Enter length of rectangle:
50
Enter width of rectangle:
60
Area of rectangle is: 3000.0
Circumference of rectangle is: 220.0