This week's book giveaway is in the JavaScript forum. We're giving away four copies of Getting MEAN with Mongo, Express, Angular, and Node and have Simon Holmes on-line! See this thread for details.

Hi, I'm in my first programming class and I'm having some trouble with part of this assignment. We have to construct concentric rectangles and take the area of the path between then (just subtract the larger from the smaller areas), and then take the diagonals of the rectangles. I have them constructed, but I'm not sure of the syntax for the math operations. Here is the code I have so far.