need the answer asap

use c++ language

a) Given the following diagram, you are required to find and display the area of the shaded region. Ask the user to enter the lengths and widths for Rectangle A and Rectangle B, respectively. Calculate the areas for Rectangle A and Rectangle B, then calculate and display the area of the shaded region. Rectangle A Rectangle B by identifying the input, process and output. i. Do your analysis (5 marks) Answer: Write a complete program based on your analysis