need help

need help with this program .... dont know how to start .. plz help:

Write a program that will ask the user to be entered necessary data to describe geometric shapes rectangle, cylinder and pyramid. According to the data entered the program display area and volume of shapes tires. The program draws the rectangle in 3D and 2D circle representing the base cylinder.
Come up with at least the basic program structure, post the code here using "<>" tag, and then ask specific questions if you run into problems
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