Arithmetic
Addition Adding two given segments is very easy. Simply copy one segment onto the endpoint of the other, and you get the sum of the two segments! 
Subtraction To subtract two segments, simply find the intersection of the two. Place one on top of the other, and where they don't cross each other is the difference between the two! 
Multiplication Given segments AB (yellow) and CD (cyan), find the product of the two.

Division Finding the quotient of two segments is almost the same as finding the product. It's simply the reverse!
