Question

What is the perimeter of the rectangle in the diagram?
http://contentlaunch.ple.platoweb.com/testimagedb/25/25bcf5ce7c84eba27a0252bbefdda1c7
A) 2(x2 – x2) + 2(y2 – y2)
B) (x2 – x2)(y2 – y2)
C) Square Root of 2(y2-y1)(x2-x1)
D) 4 square root of (y2-y1)to the second power (x2-x1) to the second power
E) 4(y2 – y2)(x2 – x2)